830 APPENDIX. 



Hippurie Add or I c H m c H COXHCH C o OH), 



- 9 9 3 v 6 5 2 



Benzol amido-acetic acid j" 

 a normal constituent of human urine, the quantity excreted being in- 

 creased by a vegetable diet, and therefore it is present in greater amount 

 in the urine of herbivora. It may be decomposed by acids into glycin 

 and benzoic acid. It crystallizes in semi-transparent rhombic prisms, 

 almost insoluble in cold water, soluble in boiling water. 



Tt/rosin or Para-oxyplien- \ ( , TT >rr\ /_/-. TT .OH \ 



yl-aniido-proprionw acid, [ ^ ^' 1 ^-^ 6 ^S^c.H,, NH a , COOH/. 



This is found generally together with leucin, in certain glands, e.y., pan- 

 creas and spleen ; and chiefly in the products of pancreatic digestion or 

 of the putrefaction of proteids. It is found in the urine in some diseases 

 of the liver, especially acute yellow atrophy. It crystallizes in fine nee- 

 dles, which collect into feathery masses. It gives the proteid test with 

 Millon's reagent, and heated with strong sulphuric acid, on the addition 

 of ferric chloride gives a violet color. 



= CH 2 , O.C,, H 33 CO 



CH, O.C H CO 



l5 31 



r\ 



0, CH 2 , CH 2 N (CH 3 ) 3 OH., 

 It is a combination of cholin with glycero-phosphoric acid in which the 

 two H atoms of the glycerine are replaced by fatty acid radicles. The 

 chemical formula varies in accordance with the kind of fatty acid; in the 

 above formula one radicle is that of oleic acid and the other that of pal- 

 mitic. In character it is a complex nitrogenous fatty body, containing 

 phosphorus, which has been found mixed with cerebrin and oleo-phospho- 

 ric acid in the brain. It is also found in blood, bile, and serous fluids, 

 and in larger quantities in nerves, pus, yolk of egg, semen, and white 

 blood-corpuscles. On boiling with acids it yields cholin, glycero-phos- 

 phoric acid, and fatty acids. 



Cerebrin, C 17 H 33 NO 3 , is a light amorphous powder, tasteless and 

 odorless, which is found in nerves, pus corpuscles, and in the brain. It 

 is a nitrogenous body whose chemical constitution is not known, though 

 the large amount of C which it contains indicates the presence of a fatty 

 acid. It swells up like starch when boiled with water. When decom- 

 posed it yields, besides other substances, a sugar (gelactose). 



Uric Acid or Tri-oxypurin, C. H 4 N 4 O 3 , occurs in the urine, sparingly 

 in human urine, abundantly in that of birds and reptiles, where it repre- 

 sents the chief nitrogenous decomposition product. It occurs also in the 

 blood, spleen, liver, and sometimes is the only constituent of urinary 

 calculi. It is probably converted in the blood into urea and carbonic 

 acid. It generally occurs in urine in combination with bases, forming 



