and Self-Fertilization" (1876), and "The Formation of
Vegetable Mould through the Action of Worms" (1881).
Ill-health, death, and burial.
Personality, tastes, and mental characteristics.
His beliefs and agnostic attitude toward religion.
His prime postulate, that species have been modified during a long course of descent.
Antagonistic views on the immutability of species.
His theory of natural selection: that all animal and plant life has a common
progenitor, difference in their forms arising primarily from beneficial variations.
Enunciates in the "Descent of Man" the great principle of Evolution, and