PLATE 26 
A. —Reaction on corn-meal agar of R5, as compared with the other strains. Cultures 
were made on November 8, 1916, and were photographed on November 27,1916. The 
two test tubes to the left show the character of the growth of strain Ri t the next two 
those of R$, and the two test tubes to the right those of R7. 
B. —A potato tuber, illustrating the results of inoculation with strain R5. The 
inoculation was made on November 5, 1916, and the photograph taken on November 
15. i 9 l6 - 
C. —An injured potato tuber (control). Photographed on November 15, 1916. 
