COMPLEX ANIMAL PRODUCTS. 43 



(42.) All the bodies in the table we have just considered con- 

 tain the residues of what may be regarded as primary, or aplone, 

 molecules; but one or other of the residues contained in the 

 several compounds included in the next table is itself a complex 

 body built up by the union of two or more simple molecules. 



Residues Polymerones 



Isethionic Ammonia Taurine 



G-lycolic Methylamine Sarcosine 



Carbonic Urea Allophan 



Oxalic Urea Paraban 



Mesoxalic Urea Alloxan 



Benzoic Glycocine Hippuric 



Cholic Glycocine Bile acid a 



Cholic Taurine Bile acidjS 



Urea Sarcosine Kreatine 



Urea Methylamine Methyluramine 



Thus taurine, of which I am able, through the kindness of 

 Mr. Lloyd Bullock, to exhibit an extremely handsome specimen, 

 contains a residue of ammonia united with a residue of isethionic 

 acid, which already contains a residue of alcohol and a residue of 

 sulphuric acid. Sarcosine, which is a constituent of kreatine, 

 contains a residue of gly colic acid and a residue of methylamine, 

 which itself contains a residue of wood-spirit and a residue of 

 ammonia. Allophan is a purely artificial compound, closely re- 

 lated to paraban and alloxan, which are products of the 

 oxidation of uric acid. These three bodies contain respectively 

 a residue of carbonic acid CH 2 O 3 , of oxalic acid C 2 H 2 4 , and of 

 mesoxalic acid C 3 H 2 O 5 , combined with a residue of urea, which 

 itself contains a residue of carbonic acid and a residue of am- 

 monia. The constitution of all three bodies is expressed by the 

 same typical equation A + B 2H 2 O = X, as exemplified below 

 in the case of alloxan : 



Urea Mesoxalic Water Alloxan 



