Tyrocidine hydrochloride. From 

 Hotchkiss (449) 



Gramicidin, From Hotchkiss 

 (449) 



e--^:^ A^'U !^^^!^^^^*^^^ 



Fumigacin. From Waksman and 

 Geiger (955) 



Gliotoxin. From Waksman and 

 Geiger (955) 



Citrinin. Prepared hy Tii 



Actinomycin. Prepared by Tischler 



Figure 19. Crystalline preparations of antibiotic substances. 



