1898 ] GERMINATION OF FUNGUS SPORES 395 
TABLE XVIII 
STRENGTH REQUIRED TO PREVENT GERMINATION 
[Expressed as parts per million] 
Substance Botrytis |Macrosporium| Gloeosporium| Penicillium | Uromyces 
MgCl 230.2 <2 3: 4.6 23 74 37 
AIS PON oi ou 1294 > 162 647 647 
OE 9010 ee ek. > 724 > 362 > 724 724 
Rees O7.88 ks > 1947 > 973 > 1947 973 
Meme AST oes > 45700 |> 228500 45700 |> 228500 
CuSO,+5H,O 247.54] 49—77 25—38 791—1237 | 49—77 
Cu(NO;).+3 H,O 
ip aee acne 58 > 58 930 58 
Cu(C,H,0,), 179.96 56 56 225 225 
CuCl.+2H,O 166.96 20 or less 20 656 41 
K,CrO, 192.92..... <— 561 4823 < 301 4823 
K,Cr,0,. 292.2..... < 228 228 < 183 456 
DeGt. $8.58. ....., > 29090 > 59190 < 119380 29090 
mie $494.55. > 547 1368 > 547 
OOH. 38.96 25... 2. > 388 1938 > 388 
NH,NO, 79.52..... 39760 39760 39760 
RI 164.76..........]. > 8238 | > 8238 > 16476 | > 8238 
ets) a > 5910 > 5910 > 11820 > 5910 
Na(C,H,0,)+ 3 H,0 
ot eee eS eet 45500 > 20250 > 81000 40500 
MgSO,+7H,O 245.7 > 12554 
BaCl,+2H,O 242.13 > 20637 
MCL 53.192... > 5313 
MgCl,+6H,O 201.88 > 9460 
K,Mn,0, 313.94 392 > 31394 1570 
POH 4485.-.._, 
H,SO, and HCl agree closely in toxic effect upon these 
fungi and are of also about the same toxic action as KCN. 
The 
fatal strength for H,SO , is nearly a one per cent. solution. 
