The same considerations throw much light on the remarkable circumstance, that in alternation of generations the reproduction is, as a general rule, agamic in one form.
"On the Origin and Metamorphoses of Insects"
Sir John Lubbock
This results from the fact that reproduction by distinct sexes requires the perfection both of the external and internal organs; and if the phenomenon arise, as has just been suggested, from the fact that the internal organs arrive at maturity before the external ones, reproduction will result in those species only which have the power of agamic multiplication.
"On the Origin and Metamorphoses of Insects"
Sir John Lubbock