324 BOTANICAL GAZETTE [NOVEMBER 
soon the inner wall at this point became ruptured, and precisely at 
7 P.M. the zoospores began their escape. The number of zoospores 
was very large and they were packed so tightly in the zoosporangium 
that it was impossible for them to make other than slight amoeboid 
movements. Those at the apex slowly moved through the opening 
one or two at a time, so that the number could be readily counted. 
In passing through the opening the zoospore puts forth a stout 
hyaline projection which feels and leads the way, and then the 
body slowly moves through. On the outside, at the mouth of the 
zoosporangium, each zoospore rests for a short time, during which 
a few plastic movements are exhibited; then it rounds off and darts 
away. 
When 50 or 60 zoospores had made their escape in this way the 
space in the zoosporangium was not so crowded, and a few of those 
at the center began active swarming movements, while those at the 
periphery of the sporangium were quiet or only exhibited plastic 
movements, and those nearest the opening continued to escape in the 
manner described. This continued until there were very few still 
within the zoosporangium. The remainder of the zoospores were 
all swarming, and at times some of them would come to rest on the 
side of the wall, put out by amoeboid movement a short pseudo- 
podium, and feel evidently for the opening. Not finding it they 
would swarm around within the zoosporangium again, and again 
come to rest, maneuver for the opening, and on finding it escape. 
This manner of finding the opening is the same as that described 
for R. globosum (ATKINSON 1894), but as the opening is larger than 
in that species, the body of the zoospore does not become constricted 
at the passaze. At 7:18 p.m. all but four of the zoospores had made 
their escape, and in four minutes more two of these had escaped, 
leaving two still within the zoosporangium. ‘These were watched 
for an hour longer, and they divided the time in swarming and feeling 
for the exit, but were unable to escape; though several times they 
located themselves directly at the opening, they seemed to be insen- 
sible of it. 
The preparation was placed in the moist chamber and left for the 
night. On the following morning both of the zoospores were found 
located on one side of the zoosporangium and each had germinated. 
