544 LIQUID PARTS OF ANIMALS. 



examination, was found to contain the following substances : 1. 

 Albumen, which was obtained by mixing the concentrated solu- 

 tion with alcohol. The precipitate consisted of a mixture of al- 

 bumen and phosphoric salts. The albumen obtained from 100 

 parts of feces amounted only to 0-9 parts. 2. Bile. By this 

 Berzelius understood a mixture of biliary matter and soda. The 

 presence of this substance was inferred from the nature of the 

 precipitate obtained by acids, and the salt of soda obtained by 

 evaporating the residue. The quantity contained in 100 parts 

 of feces was 0-9. 3. A peculiar substance, of a reddish-brown 

 colour, soluble both in water and alcohol. Acids give it an in- 

 tense brown colour. A small quantity of tannin throws it down 

 of a red colour and in a pulverulent form ; a large quantity 

 throws it down in grayish-brown flakes. It is precipitated by mu- 

 riate of tin, nitrate of silver, and acetate of lead. When heated 

 it melts and emits the smell of ammonia. It leaves behind it, 

 when burnt, traces of soda and of phosphoric salts. Berzelius 

 supposes that this substance is formed from the biliary matter, 

 by some change which it undergoes after the feces are exposed 

 to the air. The quantity of it obtained from 100 part of feces 

 was 2 -7 parts. 4. Various salts : these in all, from 100 parts of 

 feces (including the ammonio-phosphate of magnesia), amounted 

 to 1-2 parts. Their relative proportions were as follows : 

 Carbonate of soda, ' T .>. : i;^ . .. 35 

 Common salt, K.v: [j* fa *''*<.* 4 

 Sulphate of soda, . 2 



Ammonia-phosphate of magnesia, 2 

 Phosphate of lime, . . 4 



Such are the constituents of human feces, according to the ex- 

 periments of Berzelius. The following table exhibits the result 

 of his analysis :* 



Water, 1 ' . . 73-3 



Vegetable and animal remains, . . 7*0 



Bile, . ! . - . . ^V 0-9 



Albumen, \V- . '':"' V : 0'9 



Peculiar and extractive matter, = v , 2*7 



Salts, ,,,: j . . . 1-2 



Slimy matter; consisting of biliary matter, pe- 1 , , ^ 

 culiar animal matter, and insoluble residue, / 



100-0 



* Gehlen's Jour. vi. 536. 

 4 



