Publisher's Synopsis
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1882 edition. Excerpt: ...acid by addition of just sufficient baryta water, the filtrate evaporated to a low bulk and exhausted with boiling absolute alcohol. Leucine, kreatine, and urea will dissolve, and some leucine may crystallise out on cooling. From the alcoholic solution expel the alcohol by distillation till the aqueous residue forms not too thick a syrup, adding a little water, if necessary, and set aside to crystallise. Kreatine and leucine will separate while urea will remain in the mother liquor, and may be isolated by nitric or oxalic acid. (See Urea). 11. The kreatine and leucine may sometimes be mechanically separated (the former being in crystals, the latter in opaque granules) and afterwards be purified by crystallisation from alcohol. If not, dissolve the mixed deposit in hot water, and boil with zinc chloride. On cooling and standing, kreatinine, zinc chloride, and kreatine will separate in granules (see those bodies). From the liquid after precipitation of the zinc with ammonium carbonate and boiling, and evaporation of the filtrate, leucine (and homologues) may be isolated by the process given under leucine a. v.). 12. The portion insoluble in boiling alcohol must be exhausted with boiling water. Some uric acid may remain undissolved. To the boiling solution add neutral acetate as long as any precipitate is produced. Filter. 13. The precipitate may contain lead urate as well as lead, salts of inosic and similar acids. Suspend in a moderate quantity of water and decompose by sulphuretted hydrogen. The lead sulphide will retain most of the uric acid, which may be extracted by boiling with water, while the filtrate will contain the inosic acid and allied bodies, if present. 14. The filtrate from the precipitate by neutral lead acetate must be...
