_Sixty-first_, to Jonathan T. Trotter, New York, January 1, 1851. For improvement in the manufacture of India-rubber. Having described my improved process of curing rubber, I will state what I claim and desire to secure by letters patent. What I claim, therefore, is the use and employment of zinc, substantially as prepared by the process above described, in combination with India-rubber, for the purpose of curing or vulcanizing it, in form and manner as herein set forth, without the use of free sulphur in any way in combination with the rubber. _Sixty-second_, to David McCurdy, Newark, N. J., April 1, 1851. For improvement in the manufacture of India-rubber. Having described my invention, and the best mode known to me of manufacturing the same, what I claim as my invention, and desire to secure by letters patent, is the combination of potash with rubber and sulphur, and submitting the same to a high degree of heat, whereby to produce the change upon rubber known as vulcanizing. _Sixty-third_, to James Reynolds, New York, April 22, 1851. For improvement in machines for gutta-percha tubing and covering wire. What I claim as my invention, and desire to secure by letters patent, is the use, for the purposes specified, of feed-rollers, C, C, in combination with the stomach, G, G, having a lip, or mouth, _h_, arranged and operating substantially as shown and described. _Sixty-fourth_, to Nelson Goodyear, New York, May 6, 1851. For improvement in the manufacture of India-rubber. I do not claim the heating or curing process, as it is termed; that having been patented by Charles Goodyear. What I do claim as my invention, and desire to secure by letters patent, is the combining of India-rubber and sulphur, either with or without shellac, for making a hard and inflexible substance, hitherto unknown, substantially as herein set forth. And I also claim the combining of India-rubber, sulphur, and magnesia, or lime, or a carbonate, or a sulphate of magnesia, or of lime, either with or without shellac, for making a hard and inflexible substance, hitherto unknown, substantially as herein set forth. _Sixty-fifth_, to Horace H. Day, Jersey City, N. J., May 20, 1851. For improvement in India-rubber shoes.