Artificial fly

“ The natural fly delights in hovering over the stream, and performs it with that ease and beauty, which cannot be attained with the artificial, but the former often drowns when tired of making its airy evolutions, and it is then the latter best resembles it, and as a drowned fly is the artificial one taken by the fish, no art being able to make that play upon the water like the living one. ”

“ Though it would not be true to say that hitherto writers on fly-dressing have shown any lack of power of observation, still it is unfortunately true that their energy seems, strangely enough, to have stopped short at observing the natural fly, and has not been sufficient to carry them on to making even passable imitations, except of Ephemeridæ. With the exception of this family of flies, no one could possibly recognise the artificial through knowing the natural fly which it is supposed to represent. ”

“ The movement of a bird’s wings, from long years of development, has without doubt attained a great degree of perfection. Birds are able to scull themselves through the air with very little loss of energy. To imitate by mechanical means, the exact and delicate motion of their wings would certainly be a very difficult task, and I do not believe that we should attempt it in constructing an artificial flying machine. In Nature it is necessary that an animal should be made all in one piece. ”

“ A dozen well selected varieties of flies, dubbe them how ye lyke, are well-nigh sufficient for any locality. There may be streams that require a wider range of choice, but these are so rare that they may safely be considered as exceptional. Not that any particular harm has resulted from the unreasonable increase in the number and varieties of artificial flies. They amuse and gratify the tyro and in no wise disturb the master of the art. But an over-plethoric fly book in the possession of a stranger will, with the knowing, place the angling ability of the owner under suspicion. ”

“ Recalling a foregoing statement to the effect that the American fly-caster, in general, has not to any serious extent followed the theory of exact imitation of nature; moreover, in view of the fact that practically no artificial flies are to be had dressed in imitation of the native insects common to our trout waters, it should be obvious that the dry fly caster must continue to rely upon artificials of English pattern or manufacture. ”

“ Of Natural flies there are innumerable, and therefore it cannot be expected I can particularize all; but some of their names I shall nominate, viz. The Dun-Fly, Red-fly, May-Fly; Tawny-Fly, Moor-Fly, Shell-Fly, Flag-Fly, Vine-Fly, Cloudy or Blackish-Fly, Canker-Flies, Bear-Flies, [Pg 166] Caterpillars, and thousands more, differing according to the Soils, Rivers or Plants.
Artificial Flies, are made by the Ingenious Angler, according to Art, in shape, colour and proportion like the Natural Fly, of Fur, Wool, Silk, Feathers, &c. ”

“ Such birds do not expend their power so economically as the soaring birds. They do not pass much of their time in the air, but what time they are on the wing they put forth an immense amount of power and fly very rapidly, generally in a straight line, taking no advantage of air currents. ”

“ The insects possessing the greatest powers of flight, must, therefore, be sought among those in which the upper wings are wholly membranous; and we accordingly find them among the Neuroptera, Hymenoptera, and Lepidoptera. Every one who has paid the slightest attention to the subject, must have noticed how much more vigorous and sustained is the flight of a dragon-fly, a bee, or a butterfly, than that of a beetle, a grasshopper, or a plant-bug. The under wings are in every instance membranous, and are exclusively organs of flight. ”

“ Quite likely the most effective flying-machine would be one carried by a vast number of little birds. The veracious chronicler who escaped from a cloud of mosquitoes by crawling into an immense metal pot and then amused himself by clinching the antennae of the insects which bored through the pot until, to his horror, they became so numerous as to fly off with the covering, was more scientific than he supposed. Yes, a sufficient number of humming-birds, if we could combine their forces, would carry an aerial excursion party of human beings through the air. ”

“ The point has been made that even under these conditions it is best to use the dry fly on the ground that, dry or wet, the floating fly is materially, in form and coloration, a better [74] imitation of the natural fly than is the average wet fly. Under like circumstances the natural insect acts in a similar manner, that is, is drawn under the surface in broken water and carried here and there by conflicting currents. ”

“ From the shape of the wings in the butterfly or moth we can tell more or less how the insect flies. Long and narrow wings give a swift and rapid flight, broad round wings a slow and leisured flight.
The wings of insects are moved by only a few muscles, but with wonderful rapidity. It has been calculated that the common fly makes with its wings three hundred strokes per second, the bee one hundred and ninety. ”

“ It is a curious circumstance, that if portions be removed from the posterior margins of the wings of a buzzing insect, such as the wasp, bee, blue-bottle fly, etc., the note produced by the vibration of the pinions is raised in pitch. This is explained by the fact, that an insect whose wings are curtailed requires to drive them at a much higher speed in order to sustain itself in the air. That the velocity at which the wing is urged is instrumental in causing the sound, is proved by the fact, that in slow-flying insects and birds no note is produced ”

“ Every one when riding on a warm summer day must have been struck with the cloud of flies which buzz about his horse’s ears even when the animal is urged to its fastest paces; and it is no uncommon thing to see a bee or a wasp endeavouring to get in at the window of a railway car in full motion. If a small insect like a fly can outstrip a racehorse, an insect as large as a horse would travel very much faster than a cannon-ball. ”

“ This partial or complete degeneration of the wings of insects has evidently arisen from natural selection in the struggle for life. For we find insects without wings living under circumstances where flying would be useless, or even decidedly injurious to them. If, for example, insects living on islands fly about much, it may easily happen that when flying they are blown into the sea by the wind, and if (as is always the case) the power of flying is differently developed in different individuals, then those which fly badly have an advantage over those which fly well ”

“ Without, however, going into narrative detail, it should be sufficiently obvious that, under the conditions named, a very delicately dressed floating fly, in appearance quite similar to the natural ephemeridae common to the stream, attached to a practically invisible leader and riding down buoyantly on the surface, with wings erect, in the exact, jaunty manner of the natural dun, is far more apt to deceive the fish than two or more wet flies, shapeless and draggled, of dubious coloration, pulled across or against the current in a manner never followed by the natural insect. ”

“ Though it generally lives in the water, it sometimes, however, crawls out in good weather; and drying its wings by expanding them in the sun, takes flight, and becomes an inhabitant of the air, not to be known as the same creature, unless to those who had accurately observed it before: when tired of flying, or in danger of an enemy, it immediately plunges into the water. We are told that there are fourteen species of it, seven of which are common in Europe, in waters, &c.
Ephemeral Flies.—This species of insect is named ephemeral, because of its very short existence in the fly state. ”

“ The size of the wing curves and air waves bear a fixed relation to each other, and both are dependent on the rapidity with which the wing is made to vibrate. This is proved by the fact that insects, in order to fly, require, as a rule, to drive their small wings with immense velocity. ”

“ Many of my readers are well acquainted with that fly which in the latter part of summer is seen to be so annoying to the horse, buzzing about him, and every now and then dashing itself with some degree of violence against his sides and legs. This motion, to all appearance, is without design; but a closer study of the habits of the insect will show that, far from being the effect of chance, it is one of paramount importance to the existence of the fly, as on it depends the continuation of its species. ”

“ It seizes insects on wing with great agility, snapping its bill like a true Fly-catcher, now and then making little sallies after a group of those diminutive flies that seem as if dancing in the air, and cross each other in their lines of flight, in a thousand various ways. ”

“ As soon as such expansions would be of even slight use to the insect as breathing organs, the question as to their permanency would be settled. Organs so useful both for flight and aëration of the blood would be still further developed, until they would become permanent structures, genuine wings. They would thus be readily transmitted, and being of more use in adult life during the season of reproduction, they would be still further developed, and thus those insects which could fly the best, i.e. which had the strongest wings, would be most successful in the struggle for existence. ”

“ This is accompanied by the rotation of the outer portion of the wing upon the wrist as a centre, the tip of the wing, because of the ever varying position of the wrist, describing an ellipse. In insects whose wings are broad and large (butterfly) , and which are driven at a comparatively low speed, the balancing power is diminished. In insects whose wings, on the contrary, are long and narrow (blow-fly) , and which are driven at a high speed, the balancing power is increased. ”

“ To neither category belong the beetles, whose wing-covers are peculiar organs of flight, and not for direct use, and the Diptera, which possess but a single pair of wings. In the beetles the hind wings, in the Diptera the fore wings, serve especially as organs of flight. It may be observed that the Diptera are the best fliers, and that those insects which use both pairs of wings as a single pair fly better than those insects whose two pairs of wings work independently of each other. ”

“ The insect's body is lightly built and very perfectly aerated, and the principle of the insect's flight is the extremely rapid striking of the air by means of the lightly built elastic wings. Many an insect has over two hundred strokes of its wings in one _second_. Hence, in many cases, the familiar hum, comparable on a small scale to that produced by the rapidly revolving blades of an aeroplane's propeller. For a short distance a bee can outfly a pigeon, but few insects can fly far, and they are easily blown away or blown back by the wind. ”

“ There are many flies sold which appear perfectly right and natural while they remain out of the water, but which, when once they are thoroughly wetted, assume an entirely different and most inferior appearance. The loose wool and feather strands, which form the body of the fly, get matted together and the whole mass of them much reduced in size; the wings cease to stand out away from the body and from each other, and the hook, owing to the reduction of the size of the fly generally, which is effected by the tightening influence of the water, is left much too bare and prominent. ”

“ The fly is the insect of quickest flight, therefore a degree of intrigue is necessary. This is managed by running past the victim slowly, and apparently in an unconcerned manner, until the poor fly is caught unawares, and carried off by the Mellinus to its burrow. The first fly being deposited, an egg is laid. ”

“ My theory, stated briefly and more explicitly, I hope, than was the case in my article in The Field, is that under circumstances in which the wet-fly behaves more as does some creature having the power of swimming through the water, it is better to imitate this creature than any natural fly on the water, which cannot in any case behave in such a manner ”

“ The bird's wings are undoubtedly very well designed indeed, but it is not any extraordinary efficiency that strikes with astonishment, but rather the marvelous skill with which they are used. It is true that I have seen birds perform soaring feats of almost incredible nature in positions where it was not possible to measure the speed and trend of the wind, but whenever it was possible to determine by actual measurements the conditions under which the soaring was performed it was easy to account for it on the basis of the results obtained with artificial wings. ”

“ Insects, bats, and birds are as heavy, bulk for bulk, as most other living creatures, and flight can be performed perfectly by animals which have neither air-sacs nor hollow bones; air-sacs being found in animals never designed to fly. Those who subscribe to the heated-air theory are of opinion that the air contained in the cavities of insects and birds is so much lighter than the surrounding atmosphere, that it must of necessity contribute materially to flight. ”

“ Besides the system of tubes just described, many insects possess a wonderful system of air-cells, which give extra help in breathing during flight. These air-cells are largest in insects which fly most. It is a curious fact that birds have an exactly similar system; in many cases, even the bones of birds are filled with air. It is generally stated, indeed, that birds with the strongest flight have the most 'pneumatic' bones. This not quite true, for the swallow, for example, has the long bones of its wing filled with marrow, and not with air. ”

“ Taken together they make a large group that are called Scale-wings, because they alone among insects, have scales or tiny feathers like dust on the wings. Butterflies are Scale-wings that fly by day, and have club-shaped feelers; they mostly fold one wing against the other when they alight, and in the chrysalis, or bundle-baby stage, they are naked and look like an African ear-drop.
Moths are Scale-wings that fly by night, and have switch or feather-shaped feelers; they keep their wings spread open when they alight, and in the bundle-baby stage, they are wrapped in a cocoon. ”