324 Marshall Ward. — On a lily -disease. 
being about do to do mm - l° n g b y about to do mm. broad. 
At the slightly narrower end may often be seen the remains 
Of the peg-like sterigma by which it was attached to the 
conidiophore. As will be shown later these conidia are 
formed and ripen very rapidly, and they germinate at once 
in water at even a comparatively low temperature — e. g. 8°-io° 
C. — provided they have access to air. They are wetted with 
difficulty at first, but soon absorb water and swell, and the 
protoplasm is then seen to be nearly homogeneous, with 
minute brilliant granules here and there. 
In Fig. ill have drawn the chief stages of germination in 
water at a low ordinary temperature, such as prevailed this 
summer. The spore was sown in a hanging drop at 11.30 a.m. : 
at 2.30 p.m. it had commenced to germinate, a, its protoplasm 
becoming frothy, and pushing the cell-wall out at two points 
as colourless germ-tubes. At 7 p. m. the same day, the 
terminal germ-tube had grown to about four times its 
previous length, while the second one remained as a mere 
protuberance on the side of the conidium and developed no 
further, Fig. 11 d. Growth continued during the night, and 
by 10 o’clock next morning, the germ-tube was about five 
times as long as the spore, and had put forth a branch, and 
developed several septa, a". The conidium was now almost 
empty, a large vacuole occupying its interior, a", and several 
vacuoles were formed in the proximal segment of the germ- 
tube ; otherwise the protoplasm was bright and homogeneous. 
No further growth occurred, however, as the supply of food- 
material was now exhausted. 
A second example is given in Fig. 12, where it will be seen 
that the process was quite similar, the second germinal tube 
attaining a somewhat greater length before ceasing to 
develop further : and this time it was the terminal hypha 
which was the weak one. 
It is well worth notice how very little food-material is 
necessary to change the manner of germination in these 
water-cultures : it has happened in a drop containing two or 
three conidia, that one has died, and in a few hours it can be 
