Ib 



Fig 22 -The u.e of the agai cross streak method for testing the abUity of actinomycetes to 

 produce antibiotic substancef.-Upper two plates S. l..e„Mae3,W. ^idfle two pla es 

 I U,eniuUe 3440; lower two plates. S- ,«*«„ M96^Tes, bacterta. fern 



right column, M. ranae 

 B. mycoides, B. suhtilis, 

 (Original.') 



M. avium 

 E. coli W, 



M. tuberculosis 607, 

 E. coli R, S. aureus. 



M. tuherculosis 607R; , 

 (R = forms resistant to streptomycin.) 



