NON-PATHOGENIC BACTERIA. 281 



and Christensen and Hektoen,* the last two having reported 

 two of the cases. Hamburger found the four strains to be 

 nearly identical. They grow on all the ordinary culture media, 

 best perhaps on slightly acid glucose media. In cultures from 

 case No. 2 budding forms were not observed. Gross and 

 microscopical differences in the organisms are produced by 

 varying temperatures. 



The sporotricha of Schenckf which produces chronic sub- 

 cutaneous abscesses, ma'y be mentioned here, provisionally. A 

 number of skin affections, such as tinea favosa and tinea 

 trichophytina, are due to fungi, which have some similarity to 

 those above mentioned. 



Among the mould fungi, several species of aspergillus and of 

 mucor are pathogenic. Man, as well as the lower animals, 

 may be affected. In man the lungs may be involved in a 

 broncho-pneumonia (pneumonomycosis), usually due to asper- 

 gillus, and often secondary to some preexisting disease of the 

 lung. Mould fungi, especially aspergillus, may grow in the 

 external ear (otomycosis) . The growth is usually superficial. 

 These fungi rarely produce lesions in other organs. 



*Journ. Am. Med. Assn. 1906. p. 247. 



fHektoen. Journal Experimental Medicine. Vol. V. 



