tw 
CONTENTS OF VOL. I. XXVi1 
. Oviparous Animals. Male organs. Female organs. 
Egg. Impregnation. Hatching. Ovoviviparous 
Animals. 
. Androgynous Animals. Organs. Sexual union re- 
quisite in some. Hermaphroditism complete . in 
others. 
4. Gemmiparous Animals, Spontaneous division. 
. Hybridous Animals. Prevented by the selective 
attribute of the procreative instinct. Circumstances 
under which they are produced. They are barren, 
Page. 
424, 
428. 
