1921] 
ARMSTRONG—SULPHUR NUTRITION IN THE FUNGI, THIOSULPHATE 259 
successive increases at a later period, while Penicillium generally 
displays an intermediate condition. 
The ratio of the thiosul- 
phate decomposed per unit of dry weight produced is about the 
Ratio 
90 
i 
\ 
L| 
\ 4 
70) A TA 
LA ` "] 
\ / 
L| ; 
n / 
H / 
S0 \ x 
IS T Ki 
‘\ 
: uai. - 
a 
Triad 
30 
“oo, JL aa 
PR a lane a 
P d d T M e css 
10 
4 8 12 16 20 
Days 
: er . thiosulph d 
Fig. 6. Botrytis cinerea, ratio Uno MONA . 
growth 
other fungi. 
same for Aspergillus and Botrytis, with Penicillium showing a 
more economical decomposition of the thiosulphate than the 
No H,S was produced by Penicillium, and there 
was only a slight production of this compound after the twelfth 
day by Aspergillus and after the fifteenth day by Botrytis. A 
very interesting reversion of the reaction occurred in the cultures 
of Penicillium after the first determination at 4 days, and this 
may have begun even earlier. 
No tests were made for sugar in 
