when removed and weighed, has scarcely suffered the slightest appreciable difference in weight or density. Mr. Goodyear has already made arrangements to disperse heels of this material by the hogshead. He fashions them in a circular form making the outer margin of the hard material and the inner circle of the soft. The hard material is smooth and beautifully polished. It does not require blacking, and will keep its lustre a long time. The centre bulb projects beyond the surface of the hard ring, and when trodden upon yields and is flattened by the weight of the body. One of the applications of this form of heel bears directly upon the perfectibility of a boot or shoe wholly made of India-rubber. In the first place, the rotary principle of heel is employed which one might suppose almost an unnecessary arrangement, and in the next, the peculiar form of the bulb or lobe acts when pressed upon as a valve or air-pump, and sends at every step into those shoes or boots properly prepared, a certain amount of air, or perhaps it would be more correct to say, it displaces a certain amount of air which finds renewal from other parts of the boot. Is a boot made unsightly?—not in the least. They are really elegant in form and general contour. Our readers are familiar with the corrugated dress boots. The India-rubber boots we have seen closely imitated these, but it may be added, that in thus copying, Mr. Goodyear copies his own, as the corrugated dress boot was introduced more to prepare the eye for what was to follow, than to give the beau of New York, of Paris, and of London, any particular style of dress boot. In this, Mr. Goodyear displays a consummate knowledge of human nature. Had he brought out a corrugated boot without this avant courier and child of fashion, his invention might have possessed very essential recommendations but that of “optical familiarity,” and the work of years would have been as nought.