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POPULAR SCIENCE REVIEW. 
homogeneous and structureless substance — such a substance, in 
short, as the pure albumen of an egg. On the contrary, the figures 
furnish the most striking evidence that the body substance 
contains distributed within it except at the central part, a multi- 
tude of minute but well-defined granular particles, of so nearly 
uniform size as to warrant the inference that they could not 
have been introduced accidentally into the bodies of the Monera, 
but form component portions of their structure. Concerning 
these particles I shall have something more to say presently. 
But meanwhile I must invite attention to another equally im- 
portant proof of organization furnished by these figures. 
At the central portion of Fig. 1, Plate iv., a circular space 
may be noticed, presenting fewer granular particles than the 
surrounding substance. The boundary of this space, though 
faint, suffices to prove that, like the granular particles, it is 
not an accidental portion of the structure. This alone is signi- 
ficant enough, but not so significant as the fact observable in 
Figs. 2 and 3. Fig. 2, as stated in the description, represents 
a Protamceha ‘beginning to divide into two halves/ (It will 
have been noticed at p. 14(5, ante , that Haeckel speaks of this 
division as a process of reproduction). The central, com- 
paratively clear space, shown in Fig. 1, has here already 
divided, one half being retained by and constituting the central 
space of the upper dividing half of the organism as shown at 
the other being retained by and constituting the central space 
of the lower dividing half as shown at h ; the central spaces 
remaining clearly visible in Figs. 3, c and d , in which division 
is represented as having been completed. 
But, according to Haeckel, ‘ originally, every organic cell is 
only a simple globule of mucus, like a M oner on, but differing 
from it in the fact that the homogeneous albuminous sub- 
stance has separated itself into two different parts, a firmer albu- 
minous body, the cell-kernel or nucleus ; and an external softer 
albuminous body, the cell-substance or protoplasm. Besides 
this, many cells, later on, form a third, frequently absent, distinct 
part, inasmuch as they cover themselves with a capsule by 
exuding an outer pellicle, or cell-membrame/ (. History of 
Creation, Yol. i. pp. 177-8). Here, then, we have Haeckel him- 
self supplying the requisite data for a correct interpretation 
of the appearances presented by his Protamceha , and, as will 
presently be seen, his Protomyxa and Myxastrum likewise. 
The granules and the central clear space unmistakably indicate 
an already effected separation of the constituents of the proto- 
plasm into two, if not three, parts, to what degree differing 
from each other, we have at present no means of accurately 
ascertaining, except from their external characters. But for 
our immediate purpose, it is quite sufficient to know that, since 
