2 58 Ward. — On Relations between Host and Parasite 
also be thus compelled to grow on in contact with the damp 
filter-paper and not lift itself off from the spores shed on the 
leaves, by geotropic or other curving. 
The annexed tables I and II will give an idea of the 
germination capacity of the principal species used. 
TABLE I. 
Exp. No. 710. Germination of ‘ seeds’ sown on damp filter-paper in Petri-dishes, 
sterilized by steaming. Incubated at 17-5° C, rising to 20° C. 
No. 
Date. 
Seed sown. 
Treatment. 
Date of 
germination. 
Degree of 
germination. 
710 a 
June 1 2 
B. mollis 
Filter-paper at 17- 
20 0 in incubator 
15 
Good 
„ b 
5? 
B. velutinus 
>> 
16 
„ c 
B. maximus 
n 
16 
J) 
„ d 
B. sterilis 
}> 
J 5 
?? 
>> 
B. madritensis 
15 
> J 
>> 
B. asper 
}} 
0* 
O 
§ 
B. commutatus 
0* 
O 
„ h 
B. arvensis 
>> 
15 
Good 
» * 
5 ? 
B. secalinus 
n 
16 
„ k 
B. interruptus 
16 
n 
» 
B. racemosus 
>5 
15 
* Did not germinate. 
TABLE II. 
Exp. Nos. 745 and 746. Germination of c seeds’ on damp filter-paper in Petri-dishes, at 20°-23° C. 
No. 
Date. 
Seed sown. 
Treatment. 
iVo. 
sown. 
2Vo. 
germinated. 
Approx. 
% 
Date of 
germination. 
Height 
on 6th day. 
745 
July 3 
B. Schraderi 
on damp filter- 
paper Normal 
t. = 2 3 °C. 
22 
20 
9 1 
July 6 
>> 
B. tectorum 
>> 
25 
16 
64 
July 5 
10 mm. 
B. ciliaris 
J 9 
17 
90 
>> 
20-30 mm. 
>5 
B. macrostachys 
24 
5 
21 
July 8 
>> 
B. brizaeformis 
25 
21 
84 
July 6 
5 mm. 
B. erectus 
>> 
34 
0 
0 
0 
0 
B. canadensis 
J 9 
5 
26 
July 6 
„ 
>> 
B. asper 
>> 
32 
0 
0 
0 
0 
5? 
B. inermis 
>> 
4 1 
13 
3i 
July 6 
1-2 mm. 
July 5 
B. sterilis 
6 
6 
100 
July 7 
20 mm. 
?? 
B. maximus 
6 
6 
100 
55 
B. madritensis 
6 
6 
100 
>> 
746 
5? 
B. pratensis 
56 
12 
21 
July 8 
B. giganteus 
24 
0 
0 
0 
