THE WILT DISEASE OF PIGEON-PEA. 21 
The plants were grown in pots sterilised by immersion in ‘001 
per cent. corrosive sublimate for five minutes before loading with 
soil. The soil was sterilised by intermittent steaming for three 
days as in Series V. The seeds were steeped in ‘1 per cent. formal- 
dehyde for two hours. The plants in this and the following experi- 
ments were of the variety known as bani, a variety of Gossypium 
indicum which is susceptible to wilt ; and part of the same lot of 
seed sown on the Nagpur Farm was badly attacked by the disease. 
The inoculations were made by sprinkling the culture, broken 
up in distilled water, over the seeds and soil after sowing but before 
covering. 
(b) Cotton inoculated with Neocosmospora vasinfecta from gram. 
The cultures were part of the regular series mentioned under 
Series X above. 
The plants were mature plants of bani cotton seven months 
old, pots and soil being unsterilised but the seeds steeped in formal- 
dehyde as above. 
The inoculations were made by scraping away the soil down 
to the roots and placing the culture on these. 
(c) Cotton inoculated with Neocosmospora vasinfecta from indigo. 
The cultures were the same as those used in Series X above. 
The plants were grown in pots containing soil to which the 
cultures had been added about six months previously and which 
had in the interval grown a crop of indigo, being in fact the same 
pots as those mentioned below in the 3rd column of Series XII. 
The seeds were steeped in formaldehyde before sowing as 
before. 
(d) Cotton inoculated with Neocosmospora vasinfecta from 
pigeon-pea. 
The culture was that used to inoculate pot V of Series V above. 
The plants were grown in pots containing soil to which the cul- 
ture had been added ten months previously and which had borne 
