21 



• =Drop 



Diagram III. Similar to preceding diagram, n. i, and n. 2. untreated plots, a, 2 in. 

 of sterilized soil, b, f in. of sterilized sand, c, | in. sand, d, i in. of sterilized sand, 

 e, Dried out soil. 



ering of sterilized sand in this experiment is not so good as the 

 same amount of unsterilized sand, there being nine cases of Drop in 

 the former (b) and seven in the latter (c) with eight in the interme- 

 diate one n. 1. 



The I in. of sterilized sand (d) gave far better results than the 

 |- in. sand plot, there being an average of seventeen in our two 

 adjacent beds (n. 2 and c) against two in d. or a gain of 89% as a 

 result of I in. sterilized soil. The 2 in. of sterilized soil covering 

 showed no Drop whatsoever. The double plot (e) was partially 

 desiccated previous to planting and there is a slight increase in the 

 relative amount of Drop. It appears that drying the sclerotia of 

 the fungus accelerates their development, a feature we will illustrate 

 later on. Two of the plots were also treated with lime in this exper- 



a r-i b 



• = Drop 



Diagram IV'. Similar to preceding diagram, n, untreated plot, a, ij in. sterilized 

 soil, b, I in. sterilized soil. 



