392 BOTANICAL GAZETTE [ DECEMBER 
Ammonium nitrate —This permitted the growth of Botrytis 
in ¢ but notin 4. Penicillium grew in %. Uromyces was pre 
vented by 4, but grew in ~. 
Potassium, sodium, and ammonium hydroxids— Macrosporium 
gave identical results with the first two of these chemicals and 
a killing strength was not reached at ,%,. Stronger solutions 
could not be tried in drop culture. With Penicillium the fatal 
strength may be considered as #, for sodium and potassium 
hydroxids. There is an apparent anomaly in the fact that in 
one tube the fungus grew finely in KOH ¥, while its mate 
failed utterly. This can be explained on the assumption that 
one spore or more found a lodging place in a fragment of» 
unsaturated bread, and thus attained a sufficient protection and 
TABLE XVI. 
POTASSIUM IODID. 
Botrytis Macrosporium Penicillium Uromyces 
Grew Failed Grew Failed Grew Failed Grew Failed 
bed n n n 
I 
20 ? 50 * Io z 50 
* " n 
; 5° 40 - 20 
; n 
20 
ERR AONE A Mee Loe ee 
POTASSIUM BROMID. 
n n n ad 
2 2 
20 : 20 = 10 20 
Dittecemere ae 
SODIUM ACETATE. 
n m | n , n 
2 ane 2 
‘o Mo | I 
/ 
* No. 647. Some injured. + No. 645. Very few grew. 
