98 E. J. BUTLER. 
Date of sowing and 
inoculation. 
EES ei 
We | 
57 plantsin4 pots.  [noculated with Neocos-| Sown and _ inoculated / 
mospora from gram. 08 
No. of plants. Treatment. Result. 
No deaths up to 
5-3-09. 
36 plants in 2 pots. Not pre (con- |Sown 1-11-08. Ditto. 
trol). 
44 plants in 2 pots. InocuJated with Neo-|Sown and inoculated | Ditto. 
cosmospora from 7-7-08. Resown 3-11-08. 
/ gram. 
30 plants in 2 pots. Not inoculated (con-| Sown 7-7-08. Resown Ditto. 
trol). 3-11-08. 
30 plants in 2 pots. Inoculated with Neo- Sown and inoculated | Ditto. 
| cosmospora from 7-7 08. Resown 3-11-08. | 
cotton. 
25 plantsin2 pots. Inoculated with Neo- Ditto. Ditto. 
cosmospora from 
indigo. 
23 plants in 2 pots. Inoculated with Neo- Sown and inoculated Ditto. 
cosmospora from 3-11-08. 
pigeon-pea. 
These experiments show quite as conclusively as Series XI and 
XII, that Neocosmospora vasinfecta, though common on _ the 
roots of wilted plants, is purely saprophytic. 
Summary of experiments with Neocosmospora vasinfecta Smith. 
To sum up the experiments described under Series V to XIII 
above, the parasitism of Neocosmospora vasinfecta has been tested 
on four of the six crops hitherto found in India to be subject to 
wilt, and with this fungus common on the dead roots. These are 
pigeon-pea, cotton, indigo and gram. The diseases m pigeon-pea, 
cotton and gram are very similar, not only in their field characters 
and in their morbid anatomy, but also in the characters of the 
organism presumably the cause of the disease. This is a fungus with 
usually hyaline but occasionally brownish hyphe, found predom- 
inantly in the xylem vessels but also penetrating the other tissues. 
In the vessels it often forms dense masses of matted hyphz, which 
almost fill the lumen of the tube and must, of themselves, offer a 
considerable impediment to the flow of the ascending current. This 
stoppage is largely increased by a gummy exudation into the vessels, 
which commonly results from the presence of the fungus. On short 
lateral branches within the larger vessels, and also on hyphe at the 
surface of the root, microconidia are formed. These are usually 
