1921] 
ARMSTRONG—SULPHUR NUTRITION IN THE FUNGI, THIOSULPHATE 249 
B. THE USE OF THIOSULPHATE IN RELATION TO HYDROGEN-ION 
CONCENTRATION 
The experimental work as reported in the first part of this 
paper failed to show any direct relation between the use of thio- 
sulphate and the growth produced, though there were indications 
TABLE VIII 
AMOUNTS OF ACID OR ALKALI NECESSARY TO PRODUCE AN INITIAL Pg AS 
I D 
Ce. N/5 HCI Ce. N/5 NaOH 
per 50 cc. per 50 cc. Initial Pg 
final volume final volume 
2.0 3.0 
9 4.2 
0 0 4.5 
5.0 5.9 
15.0 Tol 
TABLE IX 
GROWTH AND RELATIONS OF CERTAIN FUNGI ON MEDIA CONTAINING .6 
PER CENT SODIUM THIOSULPHATE. INITIAL Pg 4.2. EXPERIMENT 16 
' Ce. Per cent 
Fungus Days pi^ b Eg N/100 Na;&O, | H:S cnr B) "sg 
Em: " lodine | decomposed P 
5 .0719 3:8 17.4 2 —- 0 
A. nig 7 . 1459 3.0 13.5 33.1 2 + 0 
E s 10 . 1553 2.0 11.6 42.5 2 + 0 
13 . 1706 3.2 9.5 52. 2 + 0 
5 . 3035 Sy 12.6 87.0 1 E 0 
P 1 7 . 5938 3.0 7.9 60.9 2 -+ 0 
ges ior 10 | .7374 | 3.2 5.3 73.7 2 + 1 
13 . 6628 5.6 6.2 69.3 3 =- 4 
5 .0160 aoe 14.2 14.8 2 — 0 
B. ei T .0416 3.9 ICI 15.3 2 — 0 
(e 10 .1166 | 3.6 | 16.7 17.3 2 T 0 
13 .1190 3.7 1 Rr d 95.1 2 0 
Control 4.2 20.2 0 3; 
