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POPULAR SCIENCE REVIEW. 
lesser and under monad becomes absorbed in the upper one ; 
the two form 44 a yellowish gelatinous flabby mass,” which grows 
spherical. Then two little openings appear at opposite points 
of the margin, with a faint line connecting them ; these two now 
giving the appearance of fig. 9. Fresh openings and radii then 
appear between each of the first four, and after a time the creature 
exhibits spots and lines all over its surface, somewhat like volvox 
globator. Further segmentations ensue, and finally a host of 
little monads are discharged. Sometimes four or six monads 
enter into conjunction instead of only two. 
Still another monad from the fish infusion afforded a new 
series of facts. It is seen in fig. 10, and is about 1 -4000th of 
an inch long, but usually rather less. Its peculiarity is multiple 
fission. First it rounds itself, then becomes a little indented* 
then like a cross-bun, then as in fig. 11, then like a bundle of 
little curved maggots, and lastly comes their separation as 
monads of the parent form. 
These, too, like the preceding, had their sexual mode of re- 
production. Some appeared larger and plumper ; they fastened 
on the common ones, as in the last case ; the absorption of the 
smaller one took place, a round mass formed, and bursting, scat- 
tered a cloud of spores so small that they could only be seen in 
a mass 44 like strong spirit poured into water.” No granules 
could be discovered even with the l-50th objective, but seven 
hours after their emission tiny dots appeared with a magnifi- 
cation of 5,000 diameters. They came suddenly into view, as if 
by quick growth, and developed rapidly. 
After a cod’s head maceration had been kept for twelve 
weeks, a peculiar monad appeared, represented in fig. 12. In 
another case a year passed without its appearance in a similar 
infusion of salmon’s head, and what determines its coming is 
unknown. It exhibits a distinct hyaline envelope, and its 
hinder part contains granular matter, above which is a nucleus- 
like body. In fig. 6 a division is seen in progress inside the 
envelope, which keeps its shape. When the division is complete 
each of the new ones thus formed divides again, and sometimes 
as many as sixteen are formed in this way, the whole swimming 
about like volvox, until one or more begins to rupture the 
envelope, and they all escape except perhaps one or two, 
which die. 
Some of the normal forms of these monads grow more granu- 
lar than others at their posterior end. They are usually larger 
than their brethren, swim freely, and suddenly dart out their 
granules. When first expelled these granules are amorphous, 
but after a time little spots appear in them, which become very 
lively in about forty minutes, and finally escape as minute bac- 
teria-like bodies. In four or five hours more they assume the 
