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6. Siebold has also published his views respecting this larval 
propagation, but we have not had any opportunity of studying 
them. (Kolliker and Siebold’s Zeitschrift.) But in concluding 
this historical notice, we must notice the later publications of 
X)r. Meinert in M. Schrodte’s Natur-historik Zidschrift , vol. iii. 
third series, an abstract of which the author sent to the Annates 
des Sciences (number for July 1866). In the first of the two 
memoirs, Meinert still maintains that the larval germs are de- 
rived from the fatty tissues of the larva. In the second memoir, he 
enters more particularly into this disputed point, and discusses 
the whole subject of animal embryogeny. The larvse discovered 
by Pagenstecher and Leuckart belong, he says, to species differing 
from that discovered by Wagner. Having succeeded in this, 
as in the other case, in obtaining the perfect insect from the 
larval form, he describes and names it Oligarces. He also re- 
peats his opinion that the germs or ova from which the larvae 
spring stand in direct connection with and relation to the fatty 
tissue, maintaining that, in Miastor, the germs remain persist- 
ently connected with this substance, whilst in Oligarces, the 
germ mass only partially separates from the fatty matter; and 
that, neither in the one nor the other, is there, as Leuckart 
insists, any proper ovary ; ” for, he observes, the whole mass 
of germ stock is broken up into germs, and none of the cellules 
supply any true ovarial stroma, nor form egg- membranes, nor 
develope into any organs or tissues having analogous functions. 
All our authors, however, agree in one point, namely, that the 
larva germ is essentially a cell-forming material, and partakes 
of the character usually assigned to female sexual organs. The 
total absence of any morphological element possessed of a male 
or fertilising function, seems likewise agreed upon, or may be, at 
least, negatively inferred. The mode of development is also 
described by each as essentially an endogenous multiplication of 
cells, which become either yolk or germ cells, or polar cells, by 
a process of differentiation, which indicates the highest forma- 
tive power inherent in reproductive organisms. Even the pro- 
toplasm, whether clear or granular, must be viewed as the 
production of cells previously active, and this organic matter, 
whether in solid or fluid state, is equally endowed with pro- 
perties that may be called vital. The self-contained power 
of evolution, whereby not merely a tissue or part of a body is 
formed, but the whole assemblage of organs and tissues which 
constitutes an individual — nay, much more, the future dimor- 
phism of yet undeveloped sexual individuals being included in 
the effect of this self-contained power of evolution — places the 
reproductive process in a different category from the repetitive 
process of growth ; and, for this reason, the propagation of larval 
germs cannot be classed with “ gemmiparous reproduction.” 
