62 MORPHOLOGY 



bases, the nucleo-protein end-products, such as guanin, adenin, 

 and xanthin in bacterial cells. Wells says that the nucleo 

 proteids of bacterial cells have been known to split off pen- 

 toses similar to higher nucleo-proteins. Certain bacteria have 

 been analyzed and found to be composed of glyconucleo- 

 proteins and mucin (e.g. B. coli) (Leach). Nencki isolated a 

 nitrogenous body from putrefactive bacteria, which is similar 

 in composition to peptone. Globulins and nucleo-albumens 

 have been reported in the protoplasm of bacteria. The 

 gelatinous material secreted by the bacteria in zooglceal and 

 pseudozooglceal formations is very similar in chemical consti- 

 tution to mucin. 



Fats have been found in the protoplasm of a large number 

 of species of bacteria. The fat has been disclosed by staining 

 reactions and by the extraction of the cells with the various 

 fat solvents, such as hot alcohol, chloroform, ether, etc. 

 Lecithin, a phosphorized fat ; cholesterin, a monatomic alcohol 

 derived from fatty acids ; simple and special bacterial fats, 

 have been isolated. Some lipochromes (coloring matter of 

 fats) are also present. The proportion of material soluble in 

 fat solvents in Bacterium tuberculosis and other acid-fast bac- 

 teria is about 20 to 40 per cent of the weight of the bacteria. 



With Sudan III, which is a characteristic stain for fat, it 

 has been possible to demonstrate fat only in Bacteria anthracis, 

 Staphylococcus pyogenes var. aureus, Bact. mucosis, and in all 

 the acid-fast bacteria, i.e., Bact. tuberculosis, Bact. leprae, 

 Bact. smegmatis, Bact. mcelleri (grass bacillus), Bact. butyri 



