Asa Gray — American Scientist born on November 18, 1810, died on January 30, 1888

Asa Gray is considered the most important American botanist of the 19th century. His Darwiniana was also considered an important explanation of how religion and science were not necessarily mutually exclusive... (wikipedia)

Your candor is worth everything to your cause. It is refreshing to find a person with a new theory who frankly confesses that he finds difficulties, insurmountable, at least for the present.
It remains to consider what attitude thoughtful men and Christian believers should take respecting them, and how they stand related to beliefs of another order.
I take it for granted that you do not wish to hear an echo from the pulpit nor from the theological class-room.
Many years ago it was taught that plants and animals were composed of different materials: plants, of a chemical substance of three elements,- carbon, hydrogen, and oxygen; animals of one of four elements, nitrogen being added to the other three.
The former conviction that these two kingdoms were wholly different in structure, in function, and in kind of life, was not seriously disturbed by the difficulties which the naturalist encountered when he undertook to define them.