PIRATE i 
Mold cultures inoculated June, 1919. 
Photographs taken July, 1920, when cultures were moist: 
A. — Penicillium divaricatum. (Cf. D.) 
B. — Penicillium rugulosum. Shows characteristic vigorous growth at this stage. 
C. — Monilia sitophila. (Cf. F.) 
G. — Aspergillus niger. 
H. —Ceratostomella sp. Blue stain. (Cf. I.) 
Photographs taken May, 1921, when cultures had considerably dried out: 
D. —Penicillium divaricatum . (Cf. A.) 
E. — Penicillium rugulosum. (Cf. B) Characteristic loss of fluffy appearance 
with time and drying out of culture. 
F. — Monilia sitophila. (Cf. C.) 
I. —-Ceratostomella sp. Blue stain. (Cf. H.) 
( 2 3 °) 
