388 BOTANICAL GAZETTE | DECEMBER | 
tion presented interesting phenomena. In strong solutions, that 
is ,%,; or stronger, it stained the protoplasm and prevented 
growth. With Glceosporium ,%, prevented growth and yo 
allowed it. At this strength the protoplasm was barely tinted. 
That strong solutions are withstood by Penicillium may be 
partly explained by the decompositions due to the organic mat- 
tér present; but this can only slightly reduce the amount of the 
salt present. 
Uromyces grew normally in ,%,, and there was practically 
no growth in ,*, or stronger, although in culture 749 one spore, 
standing unprotected in the hanging drop and to all appearances 
in the same conditions as any of the others in the drop, grew 
normally, although the protoplasmic contents of its germ tube 
were colored strongly. This apparently perfectly normal growth, 
while the surrounding spores remained completely undeveloped, 
may be taken as almost typical of the behavior of the uredo- 
spores of Uromyces caryophyllinus when in highly poisonous solu- 
tions. 
TABLE X. 
POTASSIUM PERMANGANATE. 
Gleeosporium Macrosporium Penicillium Uromyces 
Grew Failed Grew Failed Grew Failed Grew Failed 
n 
n n nm ee 2 eee 
* eee hes mar 4 40 - 
nw 
n a 2—* 
4°00 cee so 
2 n 
200 
[po ee 
*No. 749. One spore grew well. 
Sodium chlorid.— This proved practically non- -toxic. With 
Botrytis a semi-normal solution did not prevent normal germina- 
tion. 
Macrosporium grew ina normal solution. 
fungi a killing strength was not obtained. 
With these two 
