150 Wisconsin Academy of Sciences, Arts, and Letters. 
In connection with these same experiments seedlings of blue 
grass were inoculated with spores from the blue grass. Alto¬ 
gether twenty-three experiments were made, several of the seed¬ 
lings in each case not being inoculated. Infection occurred on 
the inoculated seedlings in all of the experiments except two. 
None of the controls became infected. 
My experiments with conidia from rye and blue grass thus 
confirm Marchal’s results for the forms considered. 
Marchal also states that the same special form of mildew oc¬ 
curs on all of a number of species of Poa. I have made a num¬ 
ber of inoculations with the mildew T from P. pratensis upon P. 
nemoralis, P .trivialis and P. compressa and secured some in¬ 
teresting results which do not entirely confirm Marchal’s state¬ 
ment. My results are given in detail in the following table and 
additional notes are given below. 
Table III.— Conidia from Poa pratensis. 
No. of Experi¬ 
ment. 
Date. 
Plants on which 
spores were sown. 
Age of seedlings. 
No. inoculated. 
No. of controls. 
Date. 
C 
>bservi 
® 
© 
CO . 
. w 
C5 t)i) 
o a 
w 
Controls. o’ 
P 
GO 
Blue 
grass. 
og.S 
d CO i—i 
1—1 
Con¬ 
trols. 
45 a. 
Dec. 
31 
Poa nemoralis .... 
24 
II 
II 
Jan. 
7 
12 
+ 
4 4 
++ 
- 
46b . 
M 
.4 
44 
57 
4 4 
4 4 
7 
4 4 
4 4 
4 4 
12 
4 4 
4 4 
4 4 
6 49a . 
Jan. 
2 
•« 
44 
26 
44 
4 4 
7 
“ 
4 4 
4 4 
4 4 
U. . 
12 
4 4 
4 4 
4 4 
4 4 
50a. 
6 
‘4 
44 
30 
4 4 
4 4 
12 
4 4 
4 4 
4 4 
4 4 
19 
4 4 
4 4 
4 4 
4 4 
53a . 
9 
4 i 
44 
33 
4 4 
4 4 
19 
_ 
4 4 
4 4 
It: 
26 
4 4 
4 4 
4 4 
4 4 
54a . 
9 
4 4 
4‘ 
33 
2 
4 4 
19 
4 4 
4 
_ 
4 4 
26 
44 
4 4 
+ 
4 4 
r 
64c . 
16 
4 4 
40 
II 
4 4 
26 
4 4 
4 4 
++ 
4 4 
29 
4 4 
4 4 
4 4 
4 4 
r 
65b . 
25 
4 4 
49 
‘ ‘ 
4 4 
Feb. 
1 
++ 
4 4 
4 4 
4 4 
t 
8 
4 4 
4 4 
4 4 
66b . 
25 
4 4 
4 4 
49 
2 
4 4 
1 
‘ ‘ 
4 4 
4 4 
4 4 
8 
4 ‘ 
4 4 
4 4 
4 4 
67a . 
25 
4 4 
4 4 
49 
II 
4 4 
1 
4 4 
4 4 
4 4 
8 
4 4 
4 4 
4 4 
4 4 
68b . 
27 
4 4 
51 
4 4 
4 4 
6 
_ 
4 4 
4 4 
4 4 
11 
4 4 
4 4 
4 4 
4 % 
69a . 
27 
44 
4 4 
51 
4 4 
4 4 
6 
4 4 
4 4 
4 4 
4 4 
11 
4 4 
4 4 
4 4 
4 4 
74a . 
30 
44 
54 
‘ « 
4 4 
6 
++ 
4 4 
4 4 
4 4 
15 
4 4 
4 4 
4 4 
