THE PTOMAINS. 109 



The oxygen-containing acyclic ptomains are the following : 



N(CH 3 ),(C 2 H 4 .OH).OH = C 6 H 15 NO, 



Neurin or trimethyl-vinyl-ammonium \ 

 hvdrate / 



Muscarin '. '. * '. '. '. '. '. ". '. '. '. . N(CH 3 ) 3 .(CH 2 .COH).OH = 

 Betain or oxycholin . . . ..... N(CH 3 ) 3 .(CH 2 .COOH).OH = C 5 H U NO 2 



Mydatoxin ............. C 6 H 13 NO 2 



Mydin ............. . Q,H n NO 



Gadinin .............. C 7 H 16 NO 2 



Methyl-gadinin .......... C 8 H 18 NO 2 



Mytilotoxin ............ C 6 H I5 NO 2 



Propyl-glucocyamin ......... C 6 H 13 N 2 O 3 



The remaining ptomains are partly cyclic and in part not classified : 



Collidin (iso-phenyl-ethylamin) .... C 6 H 5 .CH(CH 3 ).NH 2 = C 8 H n N 



Hydrocollidin ........... C 8 H, 3 N 



Parvolin .............. C 9 H 13 N 



Corindin .............. Cio H i5 N 



Hydrolutidin .... ....... C 7 H U N 



Hydrocornidin .......... C 10 H 17 N 



Scombrin ............. C^H^^ 



Morrhuin ............. C 19 H 27 N 3 



Asellin .............. C 25 H 32 N 4 



Morrhuicacid ........... C 5 H 3 (OH)(C 3 H6.COOH).NH = C 9 H 13 NO 3 



Typhotoxin ............ C 7 H, 7 NO 2 



Tetanin .............. C^H^NA 



Tetanotoxin ............ C 5 H,,N 



Spasmotoxin ............ 



Tyrotoxin ............. 



Pyocyanin ............. 



Pyoxanthin ............ 



Some of these substances and their origin from the albumins have 

 already been considered, and we shall have further occasion to study 

 them in greater detail. Others are scarcely known, and require no 

 further description at this place. They are all intimately related to 

 the vegetable alkaloids, with which they have many reactions in 

 common. They have strongly basic properties, and are capable of 

 combining with acids to form salts. Like the albumins from which 

 they are derived, they are precipitated with the chlorides of platinum, 

 mercury, and gold, as also with tannic acid, picric acid, phospho- 

 molybdic acid, phosphotungstic acid, etc. With these they form 

 well-defined crystalline salts, which serve for their differentiation 

 from each other and as a basis for the determination of their ele- 

 mentary composition. The methods which are employed for the 

 separation of ptomains will be considered in a subsequent chapter. 



