334 THE ACTINOMYCETES, Vol. II 



organism and the problem. This is true par- complex media may be listed certain egg 



ticularly of the pathogenic forms, of organ- media (Dorset's), blood agar, blood serum, 



isms not growing readily upon ordinary carrot plug, and others (Waksman, 1919; 



media, and of those used for special purposes, Levine and Schoenlein, 1930 ; Pridham et al, 



such as antibiotic production. Among the 1956). 



