Watts' Dictionary of Chemistry Volume 2 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1889 Excerpt: ...of so-called elementary matter should ever be effected in the laboratory, it will be by the very slow development, under conditions of prolonged chemical stress, of change in traces only. F. W. C. ELEMI A name given to various resins. Elemi occidentals is said to be the produce of Idea Icicariba; Elemi orientale to come from Amyris ceylonica. Elemi cegyptiacum is perhaps produced by Elesagnus hortensis. Translucent resins, used in making varnishes. Some specimens contain amyrin (5. -.) and elemin. Elemin forms thin six-sided prisms 200 (Johnston, A. 44, 338; Rose, A. 32, 297; 40, 307; Hess, A. 29,139; Banp, J. Ph. 3 20, 321; Buri, N. Rep. Pharm. 25, 193). Arbol-a-brea resin contains bryoidin CMHM03 136 (Fluckiger, /. 1875, 860). According to K tollhouse and Groves (A. 180, 253) incense-resin (from Idea heptaphylla) contains conimene '-', H:, and icacin CMH, 0. When elemi resin derived from Amyris elemifera and A. ceylonica is distilled with zincdust it yields toluene, m-and 2-ethyl-toluene, and ethyl-naphthalene (Ciamician, O. 9, 310; B. 11, 1344). Oil of elemi 010H, . (166) (Stenhonse, A. 85, 304); (174) (Deville, A. 71, 852). S.O. (160-180). S.G. 13 2-03. From epichlorhydrin and KI at 100' (Bebonl, A. Suppl. 1,227). Oil. EQUATIONS, CHEMICAL. The formula of an element expresses a certain quantity of that element, and the formula of a compound represents the composition of a certain quantity of that compound. When elements and compounds interact chemically, other elements and compounds are produced; a chemical equation represents, primarily, the quantities of the interacting bodies and the products of the interaction, and the compositions of these bodies. The sum of the quantities of the interacting bodies is equal to the sum of the quantities of the p..