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Ice case of a Ermen Sare, iezing the cesco Be the chief meteoro1.This question have apprakaitse Tibe langer hurricanes. There is a complete alatia Ein the little dust eddies up through larger whir winds and tornados to the awful typhoons and cyclones of China and the West Indies ;
and it has long been my opinion that if meteorologists devoted their attention to the smaller eddies that can be looked at from the outside, and their commencement, continuance, and completion watched and chronicled, they could not fail to obtain a large amount of information to guide them in the study of all cyclonic movements of the atmosphere.
Unless the smaller whirlwinds are quite distinct from the larger ones in their origin, the theories advanced by meteorologists to account for the latter are certainly untenable. According to the celebrated M. Dove, cyclones owe their origin to the intrusion of the upper counter trade-wind into the lower trade-wind current.* More lately, Prof. T. B. Maury has stated that “the origin of . cyclones is found in the tendency of the south-east tradewinds to invade the territory of the north-east trades by sweeping over the equator into our hemisphere, the lateral conflict of the currents giving an initial impulse to bodies of air by which they begin to rotate.” Cyclones having thus originated, Prof. Maury considers that they are continued and intensified by the vapour condensed in their vortex, forming a vacuum.
Humboldt had long ago ascribed whirlwinds to the meeting of opposing currents of air. I There is this dynamical objection to the theory. The movements of the air in whirlwinds is much more rapid than in any known straight current, such as the trade winds; and it is impossible that two opposing currents should generate between them one of much greater force and rapidity.
But even if this fundamental objection to the theory would be set asie, the small whirlwinds wuld not thus arie, as they are most frequent when the air is nearly or quite motionless
Then, again, wlen we turn to Prof. Jaury's theory that the eyclones, having been initiated by the conflict of contrary currents, are continued and intensified by the condensation of rapour in their vortex forming a vacuum, we find it negatived by the fact that in the smaller whirlwinds the air is dry, and there is consequently no condensation of rapour; and yet, in comparison with their size, they are of as great violence as the fiercest typhoon. Tylor describes the numerous dust whirlwinds he saw on the plains of Mexico,* Clarke those on the steppes of Russia, and Bruce those on the deserts of Africa; and nowhere is there mention made of any condensation of vapour. I myself have seen scores of whirlwinds in Australia, some of them rising to a height of over one hundred feet; yet there was never any perceptible condensation of vapour, though some of them were of sufficient force to tear off limbs of trees, and carry up the tents of gold diggers into the air. Franklin describes a whirlwind of greater violence than any of these. It commenced in Maryland by taking up the dust over a road in the form of an inverted sugar-loaf, and soon increased greatly in size and violence. Franklin followed it on horseback, and saw it enter a wood, where it twisted and turned round large trees: leaves and boughs were carried up so high that they appeared to the ere like flies. Again there was no condensation of vapour.
" Anahuac,” by E. B. Tylor, p. 21.
WHIRLWINDS AND CYCLONES.
We thus see that whirlwinds of great violence occur when the air is dry, and there can be no condensation. When, however, they are formed at sea, and occasionally on land, the air next the surface is saturated with moisture; and this moisture is condensed when it is carried to a great height, forming clouds, or falling in showers of rain and hail. This condensation of vapour is an effect, and not a cause, and takes place, not in the centre, but at the top or at the sides of the ascending column. This is well shown in an account, by an eyewitness, of a whirlwind that did great damage near the shore of Lough Neagh in Ireland, in August, 1872.* It was about thirty yards in diameter. It destroyed several haystacks, and carried the hay up into the air out of sight. It partially unroofed houses, and tore off the branches of trees. The railway station at Randalstown was much injured; great numbers of slates, and two and a half hundredweight of lead were torn from the roof. When passing over a portion of the lake, it presented the appearance of a water-spout. On land everything that it lapped up was whirled round and round, and carried upwards in the centre, whilst dense clouds surrounded the outside and came down near to the earth.
In Australia I had many opportunities of studying the dust whirlwinds; and as I looked upon them as the initial form of a cyclone, I paid much attention to them. On a small plain, near to Maryborough, in the province of Victoria, they were of frequent occurrence in the hot season. This plain was about two miles across, and was nearly surrounded by trees. In calm, sultry weather,
* "Nature," vol. vi. p. 541.
during the heat of the day, there were often two at once in action in different parts of it. They were only a few yards in diameter, but reached to a height of over one hundred feet, and were often, in their higher part, bent out of their perpendicular by upper aërial currents. The dust and leaves they carried up rendered their upward spiral movement very conspicuous. No one who studied these whirlwinds could for a moment believe that they were caused by conflicting currents of air. They occurred most frequently when there was least wind; and this particular plain seemed to be peculiarly suitable for their formation, because it was nearly surrounded by trees, and currents of air were prevented. They lasted several minutes, slowly moving across the plain, like great pillars of smoke.
When attentively watched from a short distance, it was seen that as
one was formed, the air immediately next the heated soil, which was before motionless or quivering, like over a furnace, was moving in all directions towards the apex of the dust-column. As these currents approached the whirlwind, they quickened and carried with them loose dust and leares into the spiral whirl. The movement was similar to that which occurs when a small opening is made at the bottom of a wide shallow vessel of water: all the liquid moves towards it, and assumes a spiral movement as it is drawn off.
The conclusion I arrived at, and which has since been confirmed by further study of the question, was, that the particles of air next the surface did not always rise immediately they were heated, but that they often remained and formed a stratum of rarified air next the