-24- 



littla over TJVWV but vae nearer 9 than 9.5 space* It was considered as 

 9 spaces, or 17.1 micron* long. Unconscious selection was eliminated 

 as far as possible by taking the spore* as they came in crossing the 

 field, but often masses of spore* had to be skipped. 100 spore* of 

 each strain, ae grown on the spricot fruits, were measured in this way, 

 Plate* 1-12 show graphical representations of the results. 



The curve* for spore width, with one notable and one minor exception, 

 nave a single peak. The curves for spore length all have more than one 

 peak. That is there was more variation in the length* of e set of spore* 

 than there was in the widths of the same set of spores. 

 A study of th curves reveided the following facts: 

 Strain 12, Vestrdijk* apple Sclerotiilia had the widest spore* and 

 the lonp^flt spores of all the strain*. They were also longer in proportion 

 to their width thn in any oth*r train. Strain 4 f English Sclerotinia 

 had the n*xt virteet end longest pnorn*, and the spores that 



stood next in their exci? of length ovr width. 



Aside from the*e general conclusion* nothing more definite could be 

 haxarded. Thus spore si*e difference*, in thi* case at least, did not 

 offer a vry hopeful basis for differentiation. For thi* reason no or* 

 measurement* were takan. Other worker* have laid considerable stress on 

 conidia dimension*. 



The next series of culture* wae grown on steamed rice. 1 



1 Y 10 grms of rico end 50 cc of r-ater placed in a fl^sk and 

 sterilized in the autoclave for 30 minutes at about 15 

 pound F pressure. 



