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POPULAR SCIENCE REVIEW. 
germ-cells (the analogue of the seed of flowering plants), they 
become blended with the latter, which, in course of time, be- 
come covered by a hard thick membrane, while the interior 
is changed to an orange- coloured oil (fig. 17). These red 
bodies, which have been called oospores , or eggspores, may be 
observed in Yolvox frequently at the end of the summer, and 
in autumn, producing a very marked and pretty appearance 
when combined in the same Yolvox with the other kinds. 
But Mr. Busk considered these analogous to what has been 
called, in other kindred plants, as the “ resting ” or winter 
spore, which are well known to become red at the latter part 
of the year. I think, that at present, notwithstanding the 
opinion of so excellent an observer as Cohn, the exact nature 
of these ciliated spindle-shaped bodies is hardly settled, 
because we know that similar forms are produced by the 
lower vegetable life, which are certainly not of the nature 
of antherozoids. 
The next point of interest to be mentioned was described 
by the writer in the Microscopical Journal, 1861, and shows in a 
marked degree the affinity of Yolvox to the vegetable world. 
It is this, that after the zoospores have divided to a certain 
degree towards the formation of the ciliated zoospores, instead 
of accomplishing the later divisions, each segment throws 
around itself a colourless jelly, thereby separating them to a 
distance, jproducing a mass of jelly studded with green cells, 
which have been named by the writer “ statospores,” or 
quiet spores (fig. 12). These again divide into two or four 
secondary cells, or they grow into cells of a much larger 
size (fig. 13), resembling the processes which were de- 
scribed by the writer in the January number of this Review 
of last year as seen in the green cells of lichens, 
mosses, &c. There is another curious feature worth notice, 
also described by the writer, and seen towards the end of 
the summer. When the activity of the plant is becoming less, 
and all vegetable life is preparing for the coming cold by as- 
suming a state of rest, we find some of the zoospores increase 
in size, and change colour to a reddish buff (fig. 15, a). After a 
time these become detached, and move about, not by means 
of the cilia, but by a curious change in their form, bulging 
out first in one direction then in another, whereby a certain 
amount of progression ensues (fig. 15, b). This mode of move- 
ment has been sometimes known to occur in the lowest groups of 
the animal kingdom, and in particular in the “ Amoebae hence 
this motion in the vegetable cell has been called “ Amoe- 
boid.” The writer has noticed the same motion in some of 
the immature cells of the Yolvox at an earlier period. But 
the Amoeba proper, in pushing out its processes, includes 
