296 The Botanical Gazette. 
its interior this bright red spot. This is especially striking 
when seen in one of the long terminal cells where the chro 
matophore lines but a small portion of the cell wall. In some 
cases the cells at this stage seem to have the contents slightly 
more granular than usual. The contents continue ordinarily 
to occupy the whole cavity of the cell wall up to the very in 
stant of escape, though occasionally the zoospore assumes 
pulsating the zoospore escaped in less than fifteen minutes 
The escape of the zoospores takes place normally in the ‘ 
morning, and most abundantly from eight to ten o'clock / 
though not infrequently occurring at any hour of the day. — 
Specimens collected in cold weather and brought into a warm — 
room soon begin to discharge their zoospores in abundant, — 
regardless of the time of day. They seem to be formed at 
all times of the year, having been observed by the writer 1 
first to appear (fig. 2). The whole zoospore may ape 
most instantly, or the process may be prolonged meh 
a quarter of an hour. Ina few cases the roo ke small op 
ently trying to force its way out. If the opeming 
enough for easy escape, the zoospore au é: 
shape, the body gradually squeezing through. = ‘a nai 
4 represent a speciimen in which the escape Was rather rap 
bursting of all the cells, and every é 
less end out. The other drawing (4), showing four minute 
two minutes later, was hastily outlined, and in 10 : 
every cell was empty. ; J 
The zoospore ny otis held even after eer 
its cilia, which seem to get caught either ae . t struggles? 
the mucilage covering it. Then follow vio ge duce 
get free. The opening in the cell wall scent: se for 10 
in part at least, by absorption of its substalte = 
jecting edges can be seen. 
y is frees 
