S "requiring a preliminary soaking of the seeds in water 
52 BOTANICAL GAZETTE 
ellipsoidal to spherical in shape. In most cases, however, while 
active they have the ellipsoidal form. Each one is provided with 
a prominent oil globule, usually protruding somewhat at one 
side, and a posterior cilium, three or four times its length, situ- 
ated at the end nearer the oil globule. A denser mass of pro 
plasm can be seen on the other side of the oil drop (fg. 40). 
The zoospores are active from the first, moving with a swift 
gliding motion for a short distance and then coming to rest, 
soon moving on again, so that it is rather difficult to follow one 
for any length of time. With a high power the cilium can be 
made out readily when the zoospore is at rest. The moveme 
is always i in the direction of the end away from the cilium. 
zoospores sometimes apparently remain active for twenty-t 
hours, and. possibly under favorable conditions even longet. 
amoeboid movements. They finally come completely to 
and the oil drop gradually disappears. Unless favorably s 
ated they go to pieces, the process in the last stages 
assisted by bacteria. A peculiar feature observed at thi 
_ was the appearance of a vacuole in which could be seen on 
two irregular somewhat elongated protoplasmic bodies that 
up a constant vibration which did not seem to be 
- Brownian motion (fig. 43). 3 
After it was found that the resting sporangia of this 
would germinate, it was thought desirable to see if 
information concerning its life history could be mad 
Accordingly some seeds of Alisma Plantago L. were galt 
and germinated. This germination took place very | 
or four weeks. The young seedlings first send out 4 
3 cotyle: on, and the succeeding leaves for some time ar 
SS phyllodia adapted for aquatic existence. These have 
| hyllous- epidermal cells, but are so thin that th 
