THE WILT DISEASE OF PIGEON-PEA. 51 
appeared about the 7th day and was well developed, though still 
paler than on acid potato, by the 12th day. 
14. Normal carrot—After 15 days the growth was good, 
colour pale salmon, surface moist, submerged growth in the water 
at the bottom of the tube colourless and flocculent. Spores very 
numerous, mostly slightly falcate, unicellular but also some with 
one or more septa. No macroconidia after a month. 
15. Acid carrot—Growth as in 14, but colour tint deeper 
in 15 days. Submerged growth in the water at the bottom of the 
tube in a dense pale-yellow sheet. Spores as in 14. 
16. Alkaline carrot—Growth as in 15. 
17. Normal rice.—After 15 days the growth was considerable, 
surface colour salmon pink and dry, with numerous coremial-like 
strands extending to the glass, and copious spore-formation. Deep 
colour in contact with the substratum orange-red. This was the 
deepest colour produced in any culture. In the lower part of the 
tube, where aeration was deficient, the colour varied from salmon 
pink to pale orange. 
18. Acid rice—10 drops acid, after 15 days colour as 17 but 
more brick-red (see plate ITI, fig. 3). 
19. Acid rice—5 drops acid, not distinguishable from 18. 
20 & 21. Alkaline rice—) and 2 drops alkali respectively, as 
18 but growth less and colour paler. 
22. Plantain—After 15 days growth copious, woolly not 
moist, dirty flesh-colour, coremial strands as in No. 17. Where 
the growth was confined between the medium and the glass a thick 
yellow or white stroma formed. A surface sheet, almost colourless, 
covered the liquid in the bottom of the tube and on this several 
sclerotial bodies were formed. These consisted of pseudo-paren- 
chyma, lined on the surface with crowded, erect, short conidio- 
phores from which microconidia were budded off. The whole 
arrangement corresponded to the Tubercularia stage of some Nec- 
trias. On the rest of the culture the spores were broader than 
usual 
