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1903.) PHILLIPS—A REVIEW OF PARTHENOGENESIS. 315 
result from the division. Such an argument cannot hold, since the 
fundamental principle involved is the same whether an adult 
results or not. We must consider that the life of the individual 
begins with the unsegmented egg, and if that egg has in itself the 
power of growth, manifested by cell division, then we must class it 
as a parthenogenetic egg; the only difference between such cases 
and examples like the male eggs of the bee being that there is in 
the former not so much of the power of unisexual development: it 
is merely a difference in degree and not in kind. It would seem 
that many of the cases of artificial parthenogenesis described are 
exactly similar to these cases of partial parthenogenesis, and that 
the change in environment produced artificially simply allows the 
egg the power of growth already in it to go on for a short time 
exactly as if fertilized. 
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