[Vor. 8 
258 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
Experiment 19.—' The results as presented in table xir are 
shown graphically in figs. 13, 14, and 15. All the fungi made a 
good growth on this solution, Aspergillus growing rapidly, with 
Botrytis appearing so slowly that no determinations were obtain- 
TABLE XII 
GROWTH AND RELATIONS OF CERTAIN FUNGI ON MEDIA CONTAINING .6 
PER CENT SODIUM THIOSULPHATE. INITIAL Pu 7.1. EXPERIMENT 19 
: Cc. Per cent 
Fungus | Days vidis € N/100| Na&O; | HS E » eni 
(gms. ) g iodine | decomposed paati. M 
4 .3221 | 3.4 16.9 23.5 0 T 1 
T .6840| 2.9 10.1 54.3 0 + 2 
A. nig. 9 9156 2.9 5.1 76.9 0 + 3 
12 .9168 2.9 2.0 90.9 1 n 4 
15 . 8207 2.9 1.1 95.0 1 T 4 
4 1864 | 4.4 17.6 20.3 0 + 3 
T 3595 4.9 16.3 26.2 0 + 3 
P. cycl. 9 .5026 | 5.1 16.3 26.2 0 Jj 3 
12 .6914 5.3 15.1 31.6 0 + 3 
15 6602 | 5.8 15.9 28.0 0 + 4 
7 .1352 | 6.1 19.0 14.0 0 4T 4 
9 .2687 | 5.4 15.7 28.9 0 + 4 
B. cin. 12 4143 5.2 12.8 42.0 0 + 4 
15 .6480 | 4.9 9.5 57.0 1 + 4 
18 . 7861 4.7 5.6 74.6 1 + 4 
Control — — Tai 22.1 — 0 + — 
able at the end of 4 days. Webb (’19) has found the alkaline 
limit for the spores of Botrytis to be near the neutral point, Py 7, 
and here we apparently have a case of retarded germination and 
growth until the change in reaction of the substratum has reached 
the favorable range of acidity, where a rapid increase in growth 
can occur. This will appear from an examination of table xim 
showing the successive increases in growth of each organism in 
this solution. Aspergillus usually makes relatively large and 
rapid inereases in growth, Botrytis usually attains the largest 
