In the long and tedious trials which tasked the ingenuity and power of Webster and Choate, it was clearly proven that the articles claimed to be made by specifications there introduced, _could not be manufactured_ by such compounds. To all who are interested in the facts, etc., elicited upon these celebrated trials, we would refer them to “Day’s Bible” if obtainable, containing the Genesis and Revelation of all that could then be said or written upon the subject. “The profits on the India-rubber business will reach almost two millions of dollars in the year, and the present manufactories cannot supply the demand. Shoes which weigh nine ounces per pair have only about three and a half ounces of rubber, the other materials being worth only from one to six cents per pound. One girl can make from twenty to thirty pairs per day, hence, enormous profits have been derived by the manufacturers of such goods. The best valve packing is made of 30 lbs. of India-rubber, 6 lbs. of lampblack, 22 lbs. red or white lead, and 22 oz. of sulphur; these metalizing substances are all very cheap. India-rubber is easily rendered plastic, and combines readily with almost every substance, such as the oxides of metal, clay, pulverized sand, gums, carbon, saw-dust, ground cork, &c. It is, certainly, one of the most wonderful and useful products of nature that has ever been applied to the arts.” The importance of the discovery of the vulcanization of India-rubber to the world, can hardly be over-estimated, whether regarded in the light of science, or political economy. But comparatively few years have elapsed since its highest uses were discovered and applied; and even now, with all the success which has thus far crowned the efforts of those engaged in its development, it is yet in its infancy. Like many of the most important discoveries in the mechanic arts, that of vulcanization was imperfectly applied, and millions of dollars were expended in the manufacture of improperly vulcanized goods, mills, machinery, &c.