Having described the advantages of my improvement, and the best way known to me of manufacturing the same, what I claim as my invention, and desire to secure by letters patent, is the manufacture of rubber boots and shoes without cloth, being made of separate pieces of different degrees of elasticity, and each piece having its peculiar and requisite degree, the shoe to possess different degrees of elasticity in different parts, and uniform elasticity in each different part, and having no part without some elasticity in every direction, by the means herein described, or any other substantially the same, whereby I lessen the cost, obtain a shoe not liable to break, which can be kept clean, stretched in every direction at the same time, easier to the foot, adjustable to larger boots, and yet not rendered useless to wear over smaller, light and elegant, and retain permanently their shape. _Sixty-sixth_, to S. T. Armstrong, New York, June 24, 1851. For improvement in making gutta-percha hollow ware. What I claim as my invention, and desire to secure by letters patent, in the process above described, is the method, as described, of moulding articles of gutta-percha, or the compounds of gutta-percha with other substances, by first making the same in the form of a pipe, and whilst in a partially heated and plastic state, giving to it the form required in a mould, by forcing a liquid inside to expand the gutta-percha, as described. _Sixty-seventh_, to John Ryder, New York, June 1, 1852. For improvement in the process of manufacturing gutta-percha. The claim is the preparation of gutta-percha for vulcanizing by a preliminary separate heating of it, to such a degree as to expel its volatile ingredients, which generally can be effected at the high temperatures of from 285° to 430° Fah. Mr. Ryder also claims the process of vulcanizing gutta-percha by first heating it to a sufficiently high temperature to expel all the volatile ingredients specified, which it is believed can be done between 285° and 430°, and then incorporating with it a hypo-sulphate, either alone or in combination with metallic sulphurets or whiting, or magnesia, or with all of them together, and then subjecting the mixture to a temperature of from 285° to 320° Fah., all the steps of the process being performed as set forth. Mr. Ryder disclaims the vulcanizing of gutta-percha in all cases save when it has been prepared for the vulcanizing operation by the aforesaid preliminary heating. _Sixty-eighth_, to Frederick Bonner, Vera Cruz, Mexico, Sept. 7, 1852. For preserving India-rubber. The nature of my discovery, is by applying the before mentioned quantity of Campeachy salt, or muriate of soda, to the rubber, in its sap state, and that by so doing, to prevent putrefaction and fermentation of the juice, to which, more especially, I confine the claim of my invention.