Memoir 89 



Plate III 



CULTURES OF THREE STRAINS OF R. TULIPARUM ON POTATO AGAR AT ROOM TEMPERATURE 



The three plates on the right show growth after ten days, the three on the left the same plates after 

 twenty-three day? .,-,,, 



A and D, strain (S 19")) from Kew Gardens, England. B and E, strain (S 145) from Yonkers, New York. 

 C and F, strain (B xxxv) from Holland. The distinctly slower growth of the Holland strain may be due 

 to the fact that it had been in culture since 1915, while the other two strains were isolated in 1922 



