[Vor. 8 
248 ANNALS OF THE MISSOURI BOTANICAL GARDEN 
KHSO, were added showed no growth whatever, probably due 
to the high acidity as found by titration. The good growth 
obtained on the KHSO, in experiment 13 was in a solution where 
this salt was used as a source of both the potassium and sulphur 
with only a slight acidity produced. The solution was KHSO, 
M/1, 2.5 cce.; (NHj,HPO, M/1, 6.2 cc.; MgCl, M/1, 1.0 ec. ; 
TABLE VI 
G ROWTH OF CERTAIN FUNGI ON MEDIA CONTAINING gh Kaloo PERSUL- 
PHATE AND POTASSIUM BISULPHITE. per VAL 
OF CULTURES, 4 WEEK 
Experiment 12 Experiment 13 
.3 per cent K;S.0, .6 per cent KHSO; 
Fungus A. nig. | P. gl. | B. cin. | Check | A. nig. | P. gl. | B. cin. | Check 
No. cultures 3 3 3 3 3 
Dry wt. (gms.) | .4183 | None | .1699 .2704 | .2670 | .2202 
HS 0 0 0 0 3 0 
Sporulation 1 0 4 3 0 
TABLE VII 
GROWTH OF CERTAIN FUNGI ON MEDIA CONTAINING POTASSIUM HYDR O 
SULPHITE AND MANGANESE SULPHATE. TIME INTERVAL 
OF CULTURES, 4 WEEKS 
Experiment 14 Experiment 15 
.15 per cent KSH .9 per cent MnSO, 
Fungus A. nig. | P. gl. | B. cin. | Check | A. nig. | P. gl. | B. cin. | Check 
No. cultures 2 2 2 2 2 2 
Dry wt. (gms.) | .3208 | .1039 | .2684 .4508 | .3936 | .4049 
H:S 0 0 0 0 0 0 0 
Sporulation 4 1 4 4 4 4 
FeCl, M/1000, .5 cc.; dextrose M/1, 6.9 cc. K,S was also used 
as a source of sulphur with very meagre growth obtained. Under 
the conditions of these 4 experiments, MnSO, is the most favor- 
able of the salts for the growth of all the organisms. The only 
case of complete inhibition of growth was for Penicillium on 
ees 
