130 PHYSIOLOGICAL CHEMISTRY. 



volatile fatty acids, such as formic acid, butyric acid, valerianic acid. 

 We also sometimes find chondrin (?) and glutin (?), urea, glucose 

 (in diabetes), biliary coloring matters, and bile acids (in catarrhal 

 icterus). 



As more specific but not constant constituents of the pus we 

 must mention the following : pyin, which seems to be a nucleo- 

 albumin precipitable by acetic acid, and also pyinic acid and chlor- 

 rhodinic acid, which have been so little studied that they cannot be 

 more fully treated here. 



In many cases a blue, more rarely a green color, has been observed 

 in the pus. This depends on the presence of a variety of vibrios 

 (LUCKE) from which FORDOS and LUCKE have isolated a crystalliz- 

 able coloring matter partly blue and partly yellow, pyocyanin and 

 pyoxanthose. 



Appendix. 

 Lymphatic Glands, Spleen, etc. 



The Lymphatic Glands. According to FOSTER and LANKESTER 

 and HALLIBURTON, we find in the cells of the lymphatic glands the 

 four albuminous bodies previously mentioned (Chapter III, page 42). 

 Albumoses and peptones may also occur as products of a post-mortem 

 decomposition. Besides the other ordinary tissue-constituents, 

 such as collagen, elastin, and nuclein, we find in the lymphatic 

 glands also cholesterin, fat, glycogen, xanthin bodies and adenin 

 (KRONECKER), and leucin. In the inguinal glands of an old 

 woman OIDTMAKK found 713.84 p. m. water, 285 p. m. organic and 

 1.16 p. m. inorganic substances. 



The Spleen. The pulp of the spleen cannot be freed from 

 blood. The mass which is separated from the spleen capsule and 

 the structural tissue by pressure and which ordinarily serves as 

 material for chemical investigations is therefore a mixture of blood 

 and spleen constituents. For this reason the albuminous bodies of 

 the spleen are little known. As characteristic constituents we have 

 albuminates containing iron and especially a protein substance 

 which does not coagulate on boiling and which is precipitated by 

 acetic acid and yields an ash containing much phosphoric acid and 

 iron oxide (SOBERER). 



