It is true that kites with tails have given good results in experimental work; but the tails are annoying and an unnecessary weight, and may better be dispensed with. Every boy has had the vexatious experience of sending up a kite in a light breeze with a tail made light in proportion, only to find that, on reaching stronger air currents above, the kite has begun to dive and grow unmanageable. Then, when he has taken the kite down and added a heavier tail, he has found the breeze at the ground insufficient to lift the extra load; and so, between two difficulties, has had to give up his sport in disgust. This is the one serious defect of kites with tails, that they cannot adapt themselves to wind currents of varying intensities; whereas the tailless kites do so without difficulty. And in tandem flying, which is the backbone of the modern system, the weight of a half dozen or more heavy tails would be a serious impediment, to say nothing of the perpetual danger of the different tails getting entangled in the lines. HOW TO MAKE A SCIENTIFIC KITE. It is important, then, to know how to make a scientific tailless kite, such as is used by the experts at the Smithsonian Institution, or at the Blue Hills Conservatory near Boston, for it must not be supposed that kite-flying is merely an idle pastime; it is a pleasure doubtless for boys, but it is also a field of serious experiment and observation for men. The information I here present, including practical directions as well as interesting theories, was obtained from Mr. Eddy himself, and may be regarded as strictly accurate. [Illustration: Frankfort Street. PHOTOGRAPHIC VIEW FROM A KITE. This view, from a photograph taken from a kite by Mr. W.A. Eddy, New York City at the crossing of Frankfort and William Streets.] It is much better for amateurs to begin with a kite designed to fly in strong winds, as it is a long and delicate task to learn to manage the variety with extra wide cross-stick meant for ascension in calms. The two sticks which form the skeleton should be of equal lengths, say six feet; and should cross each other at right angles at a point on the upright stick eighteen per cent. of its length below the top. This point of crossing is of great importance, and was only located by Mr. Eddy after months of wearisome experiment. He was misled in his earlier efforts at tailless kite-making by the example of the Malay kiter-flyers, who are reputed to be the most skilful in the world, and who cross the sticks much nearer the middle of the upright one. In a six-foot kite the two sticks, equal in length, should cross at about thirteen inches from the top of the upright stick; and the same proportion should be observed for kites of other dimensions. At the point of crossing, the sticks should be slightly notched, and strongly bound together with twine tied in flat knots. Driving a nail or screw through the sticks, to bind them, weakens the frame at the point of greatest strain.