1921] 
ARMSTRONG—SULPHUR NUTRITION IN THE FUNGI, THIOSULPHATE 255 
H,S and sulphates. The control flasks, though remaining 
sterile throughout, had given rise to H,S after 5 days. 
TABLE X 
GROWTH AND RELATIONS OF CERTAIN FUNGI ON MEDIA CONTAINING .6 
PER CENT SODIUM THIOSULPHATE. INITIAL Pg 4.5. EXPERIMENT 17 
: Cc. Per cent 
Fungus Days E Finial N/1 Na:S:0; H:S I - aed 
"m " iodine | decomposed p 
4 . 1251 Sal 14.8 34.5 0 — 0 
T. . 5258 2.1 4.4 80.5 0 4 3 
nem 9 .6598 | 1.8 1.5 93.3 0 + 3 
IDEE 12 | .9763| 1.7 3 98.7 0 ri 3 
15 .7578 | 1.8 T 99.1 0 + 4 
18 .4619 1.9 0 100 0 + 4 
4 . 0483 4.1 20.6 8.8 i! — 0 
4 . 2483 3.8 17.8 21.2 1 = 0 
ju 9 .3961 3.4 15.4 21.5 1 = 0 
CP 12 | .5133| 3.6 | 124 41.3 1 a. 0 
15 7455 2.9 5.6 45.2 1 ES 0 
18 .6751 | 2.0 5.4 76.0 1 + 1 
4 . 0643 3.8 19.5 13:7 1 al. 0 
7 * 3002 3.0 10.7 52.6 3 + 0 
B. cin. 9 . 2462 3.1 10.8 52.2 3 + 2 
12 4148 3.0 3.8 83.1 3 + 3 
15 4455 2.9 LI 95.1 3 + 4 
Control 4.5 22.6 71 0 
* 2 cultures only. 1 Slight after 15 days. 
Experiment 17.— he solution for experiment 17 was the 
original solution without the addition of acid or alkali. Not- 
withstanding careful technique in the preparation of the solution 
and the use of the best chemicals obtainable, the initial Py of 
the solution varied as much as .4 Py from time to time. More 
generally the reaction of the freshly prepared solution was Pg 
4.9 
The increase in growth of Aspergillus and Botrytis over that 
obtained in the previous solution was marked, while Penicillium 
