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, C2H7N3. This is a highly toxic base 

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



c. Ozamines. — 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- 

 cocoU, 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. 



