May io, 1924 Botryosphaeria and Physabspora on Currant and Apple 593 
RATIOS OF LENGTH TO WIDTH 
1.5 2 Z.5 3 3.5 4 4.5 5 
Fig. 3. Ascospores of Botryosphaeria ribis and Physalospora malorum arranged in classes 
according to width, by percentage of total spores found in each class 
