The objects of the war were now accomplished. But Shah Soojah was dead. The king we had driven from the throne, however, was still alive: Dost Mahomed, therefore, was restored; and nothing remained to be done, since the grand drama had been brought to a conclusion, but to celebrate the happy dénouement by a fête. This, accordingly, came off at Ferozepore. 'Then there was feasting and festivity in the gigantic tents, hung with silken flags, on which, in polyglot emblazonments, were the names of the actions that had been fought; many complimentary effusions, in the shape of after-dinner harangues; and in the mornings grand field-days, more or less, according to the "skyey influences." The year—a most eventful one—was closed with a grand military display. The plain was covered with British and Sikh troops, and in the presence of Pertaub Singh, the heir-apparent of Lahore; Dhyan Singh, the minister; the governor-general, the commander-in-chief, and others of less note, some 40,000 men, with 100 guns, were man[oe]uvred on the great plain. On this grand tableau the curtain fell; and the year opportunely closed in gaiety and glitter—in prosperity and parade.'
We have now concluded our task, but without having been able to convey even a faint idea of the stores of information that are contained in these valuable volumes. They are destined, however, to retain a permanent place among the books of reference which enrich our national literature, and contribute to its advancement.
OCCASIONAL NOTES
TENACITY OF LIFE IN INSECTS
However useful insects may be in the general economy of nature, it is but too true that farmers and gardeners often find them a pest, and with each returning summer the pages of agricultural journals abound with remedies, offensive and defensive, against the obnoxious invaders. In such cases, it becomes desirable to know what remedial means are the most efficacious, and we are glad to find that the question has been taken up by persons competent to discuss it. Among these, Dr J. Davy has given the results of his inquiry in a paper, 'On the Effects of certain Agents on Insects,' which has just been published in the Transactions of the Entomological Society, and is well worth reproduction in a condensed form. The experiments were begun in the winter of 1850, the season, as will be remembered, being so mild that insects were readily met with. Their objects were threefold—to test the effects of temperature, of gases, and of vapours. In the former, recourse was had to extremes of heat and cold. A bee placed in a temperature of 32° became at first more active, but the next morning was found torpid, as if dead; a register-thermometer shewing that 25° had been the lowest temperature during the night. Transferred to a temperature of 52°, the bee revived in half an hour, and on the following day exhibited the same results under the same conditions. A fly which, on December 8, was lively on the wing, in a temperature of 52° indoors, was disinclined to move at 40°; and still more so, stirring only when touched, at 33°, but did not become torpid, as in the case of the bee, even at 23°, signs of life being distinctly visible. Several trials made with different species of flies all gave the same result—a remarkable power of sustaining life. The method adopted was to enclose the insects in a glass tube, and place them out of doors all night; and though the tube was frequently covered with frost, they soon revived in the warm temperature of a room. It is perhaps scarcely possible to estimate the degree of cold which insect life will bear without destruction, since many of these creatures survive the terrible winters of the arctic regions. Still, a knowledge of the effects of reduction of temperature will be valuable, as affording data by which to judge of the effects and probable duration of visitations of insects, and of the nature of the precautionary measures to be adopted. In an experiment of alternate temperature from 40° to 65° tried for five days on a bee, the creature at last 'ceased to give any sign of vitality.'
The influence of heat appears to be much more rapid than that of cold: a fly exposed to a temperature of 120°, died in two or three minutes; and 113° proved fatal to another; while a third, placed in a temperature increased gradually to 96°, remained alive for more than an hour. Others bore from 80° to 90° for two hours; and in one instance, a fly survived from 86° to 100° for several hours, but became uneasy with a slight rise, and died at 105°. A bee, taken on March 15, from a temperature of 45°, was exposed to 80° without any apparent diminution of activity; at 90° it ceased to buzz; and at 96°, ceased altogether to move, and did not revive. Although these results are too few to enable us to determine the laws with respect to the influence of temperature on insects, they may serve a purpose, in shewing that the effect is not that gradual one of hybernation, where activity and torpor succeed each other but slowly.
In the series of experiments with gas, it was found that flies placed in carbonic acid gas became instantly motionless, and died if left for any length of time. Some revived after an hour's immersion; others, after two or three hours—the revival being slow in proportion to the time of exposure to the gas. Somewhat similar results were obtained with flies and bees in hydrogen and azote. To try the effect of deprivation, a fly was shut up in a tube with but a small quantity of common air, on the 5th February, in a temperature varying from 52° to 60° during the whole time of the experiment. The insect manifested no uneasiness until the 25th day, and was found dead on the 28th. Another fly, enclosed in a similar tube, with a quantity of air not more than a few times its own volume, became languid on the second day, and motionless on the twelfth, but revived on being taken out.
Flies immersed in oxygen were found dead the second day, with a diminution of the quantity of the gas. Coal-gas produced almost immediate insensibility, with a few feeble attempts at revival, but in no case effectual. Sulphuretted hydrogen also proved especially fatal—an instant's immersion was sufficient to destroy life; though withdrawn at once, not one of the flies recovered. It was the same when the portion of gas diffused in the air of the tube was so minute as to be scarcely appreciable. On bees, too, the effect was similar; the deadly nature of the gas on their delicate organisation being invariably destructive. Like results were obtained with chlorine.
In the class of vapours, ammonia proved fatal in one case, and harmless in another; muriatic acid stupified in two, and killed in twenty-four hours. The vapour of nitric acid was equally fatal with sulphuretted hydrogen; and, in alcoholic vapour, at a temperature of 74°, 'for a few minutes the fly shewed increased activity; in a few more, it became nearly motionless; after about a quarter of an hour, it appeared to be torpid. Now, exposed to the air of the room, in a few minutes a slight motion of its feet was seen; after a couple of hours, it was nearly as active as before the experiment; two hours later, it was found dead.' The same effects, with slight variations, were produced on other flies. With ether, cessation of motion was almost instantaneous, followed, however, by revivification, except in one instance: brief immersion in chloroform did not prevent revival, but an exposure of eight minutes killed: camphor and turpentine were both fatal: with attar of roses, musk, or iodine, no ill effect was perceptible.
The experiments with prussic acid are worthy the attention of entomologists, with whom it is often a matter of importance to kill an insect with the least possible amount of injury. In these instances, the plan pursued was to charge a small tube with the acid, and place it inside that containing the insects. The vapour of 1-16th of a grain was sufficient to destroy bees and flies; and that of seven grains proved fatal to large beetles, and the largest kind of bees. Although as yet the investigation has taken but a limited range, it will be seen that it opens a wide field of research: the next step will be to group or class those agents which appear to have produced similar effects. It is remarkable, as Dr Davy observes, 'that most of the substances which, even in minute portions mixed with common air, prevent the slow combustion of phosphorus, as indicated by its shining in the dark, have the effect, on the insects on which they were tried, of suspending animation.'
He says further: 'Some of the results may not be undeserving notice for practical purposes—as those in the instances of sulphuretted hydrogen, oil of turpentine, and camphor, in relation to the destruction of parasitical insects, whether infesting plants or minerals, or to the preservation of substances from the attacks of insects. To be applicable to the preservation of plants, of course it is necessary that the agents to be used should not exercise on them any materially injurious effects. This must be determined by experiments made expressly for the purpose. The few trials I have yet made on seeds seem to shew, that the steeping them in a solution in water of sulphuretted hydrogen has not prevented their germination. The seeds tried were mignonette, cress-seed, and that of a Nemophila: analogy—namely, that of steeping the seed of the cerealia in a solution of the white oxide of arsenic, is in favour of the same conclusion. Further, for the preservation of articles, whether of clothing or furniture, it is hardly less necessary that the substances to be employed should have no offensive odour. Judging from the effects of attar of roses, and from what we know of scented woods not being liable to be attacked by insects, the probability is, that any volatile oil of agreeable perfume will answer the purpose required, and prove a true instance of the utile et dulce combined.
'As carbonic acid gas, and some of the other agents mentioned, produce merely a temporary torpor, it may be a question whether this gas, or simple immersion in water, may not be advantageously substituted for the fumes of burning sulphur, destructive of life, at the yearly gathering of honey; the former, indeed, may be said to be in use in the Levant, where the smoke of the fire of leaves, in which the carbonic acid generated may be considered as chiefly operative, is employed to stupify the bees preparatory to the spoiling of their hives.'
CHILDREN SUCKLED BY WOLVES
This subject is one which will not be unwelcome to those whose faith in the myths of Roman history has been dissipated by Niebuhr and others: they may still believe the story of Romulus and Remus and the wolf. The Honourable Captain Egerton, in a communication from India, says: 'Colonel Sleeman told me one of the strangest stories I ever heard relating to some children, natives of this country (Oude), carried away and brought up by wolves. He is acquainted with five instances of this, in two of which he has both seen the children and knows the circumstances connected with their recapture from the animals. It seems that wolves are very numerous about Cawnpore and Lucknow, and that children are constantly carried off by them. Most of these have, of course, served as dinners for their captors, but some have been brought up and educated by them after their own fashion. Some time ago, two of the king of Oude's sowars (mounted gendarmes), riding along the banks of the Goomptje, saw three animals come down to drink. Two were evidently young wolves, but the third was as evidently some other animal. The sowars rushed in upon them, captured the three, and to their great surprise found that one was a small naked boy. He was on all-fours; like his companions; had callosities on his knees and elbows, evidently caused by the attitude in moving about; and bit and scratched violently in resisting the capture. The boy was brought up in Lucknow, where he lived some time, and may, for aught I know, be living still. He was quite unable to articulate words, but had a dog-like intellect—quick at understanding signs, and so on. Another enfant trouvé, under the same circumstances, lived with two English people for some time. He learned at last to pronounce the name of a lady who was kind to him, and for whom he shewed some affection; but his intellect was always clouded, and more like the instinct of a dog than the mind of a human being. There was another more wonderful, but hardly so well-authenticated, story of a boy who never could get rid of a strong wolfish smell, and who was seen, not long after his capture, to be visited by three wolves, which came evidently with hostile intentions, but which, after closely examining him—he seeming not the least alarmed—played with him, and some nights afterwards brought their relations, making the number of visitors amount to five—the number of cubs which composed the litter from which he had been taken. There is no account of any grown-up person having been found among the wolves. Probably, after a certain time, the captives may have got into a set of less scrupulous wolves, not acquainted with the family: the result is obvious.'
ELECTRO-MAGNETIC MACHINE
The electro-magnetic machine invented by Professor Page, has from time to time been noticed in our Journal, and we have now to give a further account of this interesting mechanism, as furnished by an American periodical. It appears that several of these machines have lately been submitted to critical examination by competent authority at Washington, and with very favourable conclusions. The principle has already been explained—namely, the alternate rising and falling of an iron rod within a helix through which an electro-magnetic current is made to pass: when the current is on, the rod rises, and remains, as it were, self-suspended, equidistant from all parts of the surrounding helix; and falls as soon as the current ceases by breaking contact with the battery. The 'rod' of one of the machines submitted to the examination weighs 350 lbs.: no sooner, however, was contact made, than it rose into its position. 'Dr Page then stood on the top of the rod, which not only sustained his weight, in addition to its own, but he pushed with his hands against the ceiling, increasing the downward pressure on the rod, which was only acted upon as a powerful spring would have been, but still maintaining its perpendicular position concentric to the inner surface of the helices. I held,' says the reporter, 'an iron rod in my hand, with the end of which I touched that of the suspended rod. I could not detach it by pulling or jerking, and could only alter its position so as to cause the annular space to become eccentric instead of concentric. The instant the battery was disconnected, the rod fell to the floor with its full force.'
By moving the wires from the battery up and down outside the pile of helices, it was clear that an upward and downward movement of the rod would follow, 'and that a shackle-bar attached from this oscillating rod, and to a crank, would convert this reciprocating motion into a continuous one.' To this contrivance the name of 'Jumper' was given, of which one was exhibited, the helices weighing 800 lbs., and the rod 526 lbs.; and by the means above mentioned, it has been converted into a working-engine, with a twelve-inch crank, and a fly-wheel of four and a half feet in diameter. 'On the outside of the helices,' to quote the description, 'was placed a line of pieces of metal, so arranged as to render the attachment with the battery and its necessary alternations performable by the engine itself. Before starting the engine, I tied an arm of the fly-wheel, at one-third greater distance from the centre than the length of the crank, to an upright beam of twelve inches diameter, which formed part of the frame of the engine. The cord used was the better kind of bed-cord, of great strength, nearly three-eighths of an inch thick. This was passed twice round the fly-wheel arm and post before being tied, and with pieces of sole-leather intervening, to prevent the cord being cut by the corners of the post. Such a fixture, I am confident, would have held a five horse-power steam-engine from starting, with full pressure of steam on the piston, and no previous motion. Not so, however, with this engine, for the breaking of the cord and contact with the battery occurred at the same instant of time, leaving an impression in the beam to the depth of the cord, despite the protection of the sole-leather.' The engine continued to work in the most satisfactory manner; and Dr Page attached a circular-saw, which was used in wood, to a depth of six inches, and at a speed such as could be anticipated from the power which we afterwards found the engine to possess.
Careful experiments made to test the power of the engine, shewed it to be equal to seven horse nearly; and the estimate for consumption of acid and use of zinc is twenty cents for each horse-power per day of twenty-four hours. The escape of acid vapours from the batteries is an evil that will have to be guarded against, to prevent the pernicious effects produced in several electro-plating establishments, where the health of the workmen has been seriously injured by the liberated gases. This defect being overcome, Professor Page's electro-magnetic engine may become highly valuable in engineering and manufacturing processes. To quote the conclusions of the report—'the cost will be less than that of a steam-engine of the same power: the weight will be but one quarter, if boilers and contents be taken into account: the expense of firemen and engineers is dispensed with: buildings, and stocks of goods, and vessels may be more cheaply insured than when steam-engines are used, as there could be no risk from explosion or fire: the expenses are only active while the machine is positively in action, whereas an ordinary steam-engine continues its expenses whenever the fire is burning.
'Dr Page's engine, if used ten times during the day, of six minutes each time, would have but one hour's expenses for the day; whereas a steam-engine, under similar circumstances, would be subject to nearly or quite the full expenses of fuel for twenty-four hours, or equal to the expenses of continuous work.'