Are Human One Race of Many?

External differences due to climate, food, habits, ect.

Argued that many races remain altogether unchanged.

“Natural Selection” with animals depends on “self-dependence and individual isolation”
-keeps animals uniform standard

Humans are more sympathetic, keeping the sick alive. This increases mental and moral qualities .
-Help learn to use nature for survival. (live in harmony with environment helps keep numbers)

“Great modifications of structure and of external form, which resulted in the development of man out of some lower type of animal, must of occurred before his intellect had raised him above the condition of the brutes”
-helps resist natural selection

"kept in harmony with the slowly changing universe around him by an advance in mind rather than body”

“common origin of all mankind”