8 TOXINS AND ANTITOXINS. 



stance trimethylene diamine, the collidines, and 

 the parvolines. 



b. Guanidines. Among the products of ordinary 

 putrefaction there has been found so far only methyl- 

 guanidine, C 2 H 7 N 3 . This is a highly toxic base 

 of which 0.2 Gm. is fatal to a guinea-pig. 



c. Oxamines.- -Under this designation the fol- 

 lowing bases are comprised: i. Neurine bases; 

 2. oxygenized aromatic bases; 3. bases of un- 

 known constitution. Amongst them we find neu- 

 rine and choline, which are toxic, and betaine, which 

 is innocuous. They are found particularly in 

 putrid fish. 



d. Amido Acids. These ptomaines, which are 

 usually innocuous in small quantities, are par- 

 ticularly the products of the decomposition of albu- 

 minoid substances. Among them we find gly- 

 cocoll, leucine, and tyrosine, as members of this 

 group. 



e. Carbopyridic and Carboquinoleic Acids.- -So 

 far only one base is known belonging to this 

 group, and that is morrhuic acid, which is found 

 in the decomposed livers of codfish, and which 

 is a powerful appetizer and stimulant in disassimi- 

 lation. 



/. Undetermined Ptomaines.- -Under this head- 

 ing are classed certain undetermined bases, such as 

 those found in normal urines, and in spoiled meats 

 and bread. 



