592 
Journal of Agricultural Research 
Vol. XXVIII, No. 6 
WIDTHS IN MICRONS 
4 5 6 7 6 9 !0 II !Z 13 /4 
Fig. 2.—Ascospores of Botryosphaeria ribis and Physalospora malorum arranged in classes according to 
ratio of length to width, by percentage of total spores found in each class 
