38 



Killing of Botrytis Spores by Phenol 



Table XIV. 26. 11. 19. Phenol 0-6 Table XV. 17. 12. 19. Phenol 0-7 



per cent. 50 day spores. 25°. 



per cent. 50 day spores. 25-2°. 



In Fig. 4 are charted the results of four experiments with 0-4 per 

 cent, phenol and spores which varied in numbers from 5000 to 2,700,000 

 in each c.c. of the kilhng mixture. If we plotted on the same figure the 

 curve already shown in Fig. 1, where 150,000 spores were used, its 

 graph would come between the 11,400 and the 1,000,000 curves. It is 

 evident that the increase in the number of spores has greatly slowed 

 the rate of kilhng. With the largest number all are still aUve after 

 one hour. If this experiment had been continued I do not doubt that 

 the curve would have eventually begun to drop like the others. The 

 same thing is seen in the 0-6 and 0-7 per cent, experiments. The larger 

 the number of spores employed, the more marked is the delay in the 

 early part of the curve. 



The bearing of these facts on infection is evident. It is well known 

 that the larger the size of the inoculum the greater is the chance of a 



