48 CHEMICAL PHYSIOLOGY. 



cent, of earthy phosphates, and 4 per cent, calcium 

 fluoride. 



PUS. Pus is a product of disease or injury. It consists of 



a serum, in which many corpuscles, resembling the 

 white corpuscles of the blood, are suspended. From 



?Spus n ciel n the corpuscles, separated by filtration, myosine (see 

 muscles) is obtained. This substance is probably the 

 instrument of the contractility of these bodies. The 



paragiobu- serum has fibrino-plastic properties, i.e., contains para- 



line, caseine, 



globuline, which can be precipitated by carbonic acid ; 

 on addition to the filtrate of acetic acid potassium albu- 

 minatejDr caseine is precipitated, and after the removal of 

 this latter serum albumen is precipitated by heating. 

 Mucine has never been found in pus. Chondrine and 

 glutine have been found in the filtrate from the pus 

 coagulated by boiling. They are probably connected 

 with the corpuscles, like the glutine which is found in 

 the blood in leukocythsemia. Pus, probably in its cor- 

 . puscles, contains cerebric acid and cholesterine ; the 



Cholesterine. r 



latter is deposited on standing. During standing and 

 decomposition pus also deposits palmitic and stearic 

 acid in crystals, oleic acid after addition of acetic acid. 

 i'atty adds. Q O od or healthy pus from wounds contains no volatile 

 volatile fatty acids, but decomposing pus yields volatile acids of the 

 fatty series, formic, butyric, valerianic, in short pro- 

 ducts of putrefaction. Pus from abscesses, from 

 phosphorus disease, and ulcerating cancers, contains 

 an acid, which as it gives a rose-pink reaction with 

 chlorine water, has been termed chlorrhodinic acid. 

 A similar substance can be obtained from decomposing 

 pancreas extract and lymphatic glands. Pus may con- 





