476 FATE OF BODY-FOREIGN SUBSTANCES 



acid may, if brought into contact at room temperature with 

 ammonium carbonate, form, when heat is applied, a molecule 

 of acetalanin: 



CH,.C;6~JCOOH CH 3 .CH.COOH 



NH.iHa! = NH + CO a + H 2 0. 



CH,.CO.|COO|H CHs.CO 



Alkylation Finally it should be recalled (vide supra, 

 p. 132) that the body is able to bring about a simple alkyla- 

 tion. Thus after introduction of selenic or telluric acid into 

 the body, according to F. Hofmeister, selenium-methyl or 

 tellurium-methyl seems to appear; and, according to J. 



Pohl, 58 thiourea, CS/ , may be partly changed into ethyl 



5 . On the other hand, the transformation, 

 i 



CH 



HC f ^~ CH 



observed by His, of pyridin, | , into methylpyridyl- 



HC N. x^ CH 



N 

 CH 



HC 



ammonium-hydroxide, 59 HC^y'CH ^ ag k een definitely as- 



N 



/\ 

 CH 3 OH 



certained. We are apparently dealing with a methylation 

 process, too, in the change, described by Neuberg, 60 of ethyl 

 sulphide into the diethylmethylsulphinium base, 



C 2 H 6 CH, 



s 

 / \ 



C 2 H 6 OH. 



08 J. Pohl (Prague), Arch. f. exper. PathoL, 51, 341, 1904. 



69 Cf. E. Abderhalden, C. Brahm and A. Schittenhelm, Zeitschr. f . physiol. 

 Chem., 59, 32, 1909. 



w C. Neuberg and Grosser, Deutsche phys. Ges., 1905, Centralbl. f . Physiol., 

 19, 316, 1905. 



