668 The Theory of Sex and Sexual Genests, 
spring. The explanation of this advantage may be given as fol- | 
lows: In order that a germinal aggregate may develop into a 
distinct individual, with a due codrdination of its parts about a 
distinct axis or center, the formative conditions within it must 
first be, in some manner and to a great extent, isolated from the 
formative conditions in the parts of the parent-body in connection 
with which its production as an aggregate has taken place; 
otherwise its unity of development as a distinct individual would 
be interfered with, or we may say would be impossible. For this 
reason the size which a bud is required to have in order to enter 
upon an individual development is much greater than the sit 
which a germ-cell is required to have. This follows from the 
manner in which a bud is formed. In the simplest case for mul- 
ticellular organisms, a bud is formed by the outgrowth by cell 
multiplication of an aggregate of cells from a layer of undifer 
entiated cells of the parent body. Thus in the first stages a 
growth of the bud, both the cells which compose it and the cë! 
of the layer from which it is produced, must be a, a plas 
formative state in order that the growth of the bud m pre 
ner may go on. And the isolation that is requisite to its 
individual development is only brought about by sheer 
growth away from the producing cell-layer. That m ; 
must necessarily, from the mode of its formation, attain iai 
erable dimensions before its independent development a 
On the other hand, where the development the form 
contents of a single germ-cell, the requisite isolation age 
tive conditions within it is brought about, not by E actly differ- 
but by the germinal mass becoming inclosed by.a di in the 
. And thus, 35 °°" 
entiated cell-wall, or capsule, or embryo-sac. ee opment maf 
higher plants, we find that the first stages in the d cel T 
take place with the new individual completely vor vital pro 
sides with tissues of the producing organism pee itself for 
cesses are actively going on. This suron a y much 
` a small bud, but one of low organization an of selman 
smaller than any bud that is fitted for for isolated ® 
nance. The eggs of animals in like manner jee organ be 
their formation, but are discharged from the p 
fore their development begins: greater mu 
. immensely : 
In consequence of these relations an "a opment can be 
ber of seeds or eggs fitted for a complex 
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