[F] Any good laundry soap will serve, but it should be sliced thin.
[G] Information as to the usual types of wheel may be obtained from The Crossley Manufacturing Company, Trenton, N. J.; The Patterson Foundry and Machine Company, East Liverpool, Ohio; a wheel operated like a sewing machine is sold by the Lewis Institute, Chicago.
[H] The Milligan Hardware Company, East Liverpool, O.
[J] The Roessler & Hasslacher Chemical Company, 709 6th Avenue, New York City, manufacture glazes according to the recipes of the author, and also chemicals for use in the laboratory.
[K] It is admitted that glazes are not chemical combinations but solid solutions, but the principle is more easily understood when the analogy of chemical action is adopted.
[L] Paul O. Abbé, 30 Broad Street, New York City.
[M] These kilns are made in several sizes by the H. J. Caulkins Company, Detroit, Mich.
[N] The pyrometric cones are fusible pyramids for testing heat. They are made by Prof. Edward Orton, Jr., Columbus, Ohio.
[P] Keramic Studio Publishing Co., Syracuse, N. Y.
[Q] The Harris Kaolin Company, Dillsboro, N. C.