Descartes.
Descent, history of doctrine of.
"Descent of Man", G. Schwalbe on "The".—Darwin on Sexual Selection in "The".—rejection in Germany of "The".
Desmatippus.
Desmoulins, A., on Geographical Distribution.
Detto.
Development, effect of environment on.
Dianthus caryophyllus.
Diderot.
Digitalis purpurea.