MICHIGAN ACADEMY OF SCIENCE. 
59 
mentioned was the stock solution and the second the actual Bordeaux pre- 
pared as indicated above. 
From the experiments with Bordeaux mixture, two sets of experiments 
were worked out, with (1) the mixture well shaken up (2) the supernatant 
liquor, without any precipitate. 
As the ordinary user of Bordeaux mixture or of copper sulfate would not 
be likely to interpret readily what is meant by a normal solution, and, as 
the method usually employed in making up solutions of copper sulfate or 
other substance, is to reckon it in percentage strength, a list is here given 
showing the relation between percentage solutions and normal solutions. 
/ 
Of copper sulfate crystals normal solution=12 . 5% 
1 /2 “ “ =*6.25% 
1/4 “ “ = 3.125% 
1/8 “ “ = 1.5625% 
1/1024 “ “ = .012% 
Of dehydrated copper sulfate a normal solution= 8.05% 
1/2 “ “ =* 4.025% 
As a matter of course, the normal solutions are the same in each case, 
that is, they contain the same actual amount of copper sulfate to a given 
amount of water, but where crystalline sulfate is used, the amount of water 
of crystallization which is approximately 36 per cent by weight of the sulfate, 
has to be taken into account. 
In the following tables, is given in each case the name of the toxic agent 
and, in the first horizontal column, the strength of solution used. In this 
column, for convenience only, the denominator of the fractional normal 
solution is placed; that is, 256 means n/256, etc. Only the name of the 
genus of fungus is given in the first vertical column, but the name o' the 
species has already been stated, so need not be repeated. In the other 
columns, the letters indicate : — G germinated certainly; S slightly, or only 
very small in amount; 0 no germination whatever. Where a question mark 
occurs, it means that repeated experiments did not agree. 
I. HC1. 
8 
16 
32 
42 
64 
128 
256 
Penicilium 
0 
S 
G 
G 
S 
G 
G 
Macrosporium. . 
o 
O 
G 
G 
G 
Ustilago 
s 
G 
G 
G 
Puccinia 
o 
(4 
G 
Glomerella 
0 
O 
G 
G 
II. H 2 S0 4 . 
8 
16 
32 
42 
64 
128 
256 
Ppd ir»i]i nm 
0 
(?) O 
s 
G 
G 
G 
l\fn ppf>spori uni 
0 
s 
G 
G 
G 
Ustilago 
0 
s 
G 
G 
G 
G 
