provided the latter

0

purity, he submitted urine to congelation, and evaporated the concentrated liquid in vacuo, employing afterwards alcohol and ether for the purpose of extracting it from the residue.  Moncler , Moncler jacket, Moncler K2 vest black, Moncler K2 vest Pink  No part of the process described by him would induce any extensive decomposition of the substance under examination. On the other hand, it is very doubtful whether it was quite free from impurities, since he attributes to the coloured extractive matter (farbender Extractivstoff) of urine   Moncler jackets, Moncler Multiple K2 Vest Beige  the property of inducing decomposition in urea, and consequently in urine also—a property which it certainly does not possess when pure, however liable it may itself be to decomposition. The putrefaction of urine, which manifests itself by the conversion of the urea into carbonate of ammonia, must be caused by some other body. The extractive ma  Moncler jackets for men, Moncler Alpin, Moncler Angers, Moncler Bady  tter does not act as a ferment, which may indeed be inferred from the very small quantity of nitrogen contained in it. The disagreeable odour which the watery solution of Lehmann's substance began to exhale when exposed to the air also points to some impurity. Its acid reaction he attributes to an admixture of lactic acid, which was generally supposed to be contained in urine, until its entire absence was proved b  Moncler Branson Jacket ，Moncler Branson Navy , Moncler Bea  y the experiments of Liebig. Lehmann's observations regarding its other properties, as, for instance, the changes of colour produced in its watery solution by various reagents, are, however, remarkably correct. Lehmann, as well as Berzelius, found the substance to which healthy urine owes its colour to be completely soluble in water. Subsequently, however, most of the attempts which were made to isolate the colouringmatter of urine ended in the separation of substances quite insoluble in water. These must in all cases have been products of decomposition ; for I consider it quite certain that al  Moncler down jackets, Moncler Multiple K2 Vest Black   l colouring-matters derived from urine which are insoluble in water are not contained as such in the secretion, provided the latter is in its normally acid state. In the experiments of Scherer f and Harley J, various products of decomposition of this kind seem to have been obtained. Scherer, not being satisfied with the methods of preparing and separating the extractive matters given by Berzelius, adopted one of his own, which yielded a brown humus-l  Moncler jackets women, Moncler Boutique  ike substance, insoluble in water, but soluble in alcohol and alkalies. Scherer calls this * Journal fiir praktische Chemie, B. xrv. S. 1. t Annnlen der Chemio unci Pharmacie, B. lvii. S. 180. { Pharmaceutical Journal, vol. lii. p. 243. substance the colouring-matter of urine, though it must be evident to any one reading his account that it was a product formed by the action of hvdrochloric acid on the extractive matter, and essentially the same as that previously obtained by Proust. Scherer submitted his substance to analysis, and found its composition to vary exceedingly. Hence it may be inferred that it consisted of a mixture of two or more

0