50 E. J. BUTLER. 
7. Standard solution + asparagin.Surface growth better and 
submerged growth worse than with peptone, after a week. Then 
improved and after 15 days the surface was nearly covered with a 
moist white growth with well defined margins and concentric, slight- 
ly raised, lines of growth. In two months all growth had appar- 
ently ceased. Spores not numerous, only microconidia. 
8. Standard solution+ citric acid.—The only growth visible 
after a week was a number of minute flocculent colonies. These 
increased subsequently but little and never developed any colour. 
A moderate number of all three kinds of spores developed. 
9. Standard solution+ sodium carbonate—No visible growth 
at the end of two months. 
10. Standard solution + alcohol.—No surface growth resulted 
at any time. The submerged growth was thin and filmy but fairly 
abundant. Microconidia abundant, macroconidia and chlamydo- 
spores few. 
11. Normal potato.—After three days the surface was practi- 
cally covered with a dense rough growth, grey or white at the base, 
but with dirty pink patches over a considerable portion. After two 
months the whole slab was covered with an even, moist, non-fila- 
mentous growth of a dirty cream colour. All the potato cultures 
bore eventually all three types of spore. 
12. Acid potato.—After three days the whole slab was covered 
with a dense moist growth, mostly salmon pink from copious 
spore formation (see plate III, fig. 2). The growth in this tube 
remained one of the best of the series. After some months the 
upper part of the slab was nearly black from a development of 
thick-walled brittle hyphz, with short segments and brown walls. 
_ A few small pink sclerotoid bodies, similar to those described under 
No. 22 below, were found after about four months. 
13. Alkaline potato.—After three days the growth was in iso- 
lated white woolly tufts with no trace of colour and without the 
moist appearance of 12 (see plate III, fig. 1). A pmk tinge 
