Ix 
reproductive bodies in Aphis and other similar cases, but he blames 
Huxley for attributing the same term to the “true eggs, which are 
capable of spontaneous development.” 
Now between a normal egg and the pseudovum of Aphis every 
intermediate term exists. No important morphological line of de- 
marcation can be drawn. On the other hand, a body which is 
capable of spontaneous development, whatever its form may be, and 
whether it is susceptible of impregnation or not, is very different from 
one which requires impregnation as a necessary antecedent to deve- 
lopment. Herein, then, lies a true difference, and I certainly think, 
therefore that (as, indeed, I suggested in the year 1856) it is con- 
venient to have some term for self-fertile ova, whether susceptible of 
impregnation or not, whereby they may be distinguished from other 
ordinary eggs, to the development of which impregnation is a neces- 
sary antecedent.* 
~ Prof. Leuckart’s criticism, however, derives a certain amount of 
support from the name which Prof. Huxley nas given to Wass repro- 
ductive bodies. The name “ pseudovum,” or “ false egg,” may be ap- 
propriate enough in the case of Aphis, or Coccus, or even of Daphnia. 
It is not, however, well adapted to that of Cynips, and still less to 
those of the bee or the silkworm moth. The so-called “ pseudova” in 
these cases are not “‘ false eggs ;” they are, on the contrary, true eggs 
—and something more. They possess, in fact, all the characters of 
true eggs, combined with a greater amount of vital energy. ‘ Euova” 
would seem therefore to be a more appropriate term for them than 
“ pseudova.” 
Mr. Darwin’s last edition of the ‘ Origin of Species’ contains many 
illustrations from Entomology which were not present in the first. 
Several of these are of great interest. As an example, | take his 
remarks on the influence which insects have exercised on the beauty 
of flowers. If bees owe their honey to the flowers, flowers, on the 
other hand, it would appear, owe their beauty to the bees. ‘‘ Flowers,” 
says Mr. Darwin, “rank amongst the most beautiful productions of 
* Even here, however, intermediate stages appear to occur. Many cases have 
been observed in which yolk division commences in unimpregnated eggs, and in 
insects the embryo is sometimes formed, before the vital energy of the ovum is 
exhausted and the process stops. It is even stated that young born from agamic eggs 
are particularly weakly, as if even after birth the absence of male influence showed 
itself in a want of vital energy. 
