1898 | GERMINATION OF FUNGUS SPORES 
381 
TABLE I. 
MERCURIC CHLORID. 
Botrytis Macrosporium Penicillium Uromyces 
Grew Failed Grew Failed Grew Failed Grew Failed 
I * Ww wm I a 2 112 2 n 2 n 6 PE ck 
51200 4 12800 3 819200 81g2co 25600 3200 204800 6400 
n n n n n n 
3 102400 5 25600 5 409600 T 3 409600 . 12800 : 51200 
n n n n n n 
8 204800 - 51200 4 met ele 6 204800 . 6400 3 25600 
n nt n n 
: 102400 / 102400 3 102400 6 3200 § 4 an 
4 51200 
” 
4 25600 
* No. 436. Growth scattered. 
T No. 157. Four cultures normal and one slight but uniform. 
{| No. 200. Scattered growth. 
Mercuric chlorid.—Thus we see that Botrytis grew in syye00 . 
in eight different cultures, and there is no evidence that this 
Strength injures it. In eet eee threé cultures grew normally and 
one failed to grow. The growth here may be considered as 
normal. In 5,59) twice as strong as the last, growth was poor 
i one culture, two failed utterly, and the strength necessary to- 
prevent germination is evidently reached. Five cultures of twice 
this strength or ,.*,, were tried, but all failed to germinate. 
So it can be concluded that the strength which prevents most 
spores from growing is ;,%,,, and that 5,759 is a sure preventive. 
Then the range from sure prevention of growth to a normal 
growth is from ..%,, to +, : 
With Macrosporium the growth was normal for grgs00" 
pes toovoy and ,,7.,, grew but gave evidence of injury, and 
s1z00 Proved a sure preventive. With Penicillium, starting with 
