[42.1]

[Letter not transcribed]

[42.1v]

[Proof sheet of Forms of flowers, p. 92, published p. 181.]

[42.2]

[Letter not transcribed]

[42.2v]

[left side of page excised]

tered by naturalists as of specific

ct of the races of man being

sites, which appear to be specific=

ightfairly be urgent l as an

the races themselves should

distinct species.) (Our

ring proceeded thus far in his

tigation, would next inquire

of man, when crossed, were

terile. He might consult

[Descent 1: 220: "With insects slight structural differences, if constant, are generally esteemed of specific value: and the fact of the races of man being infested by parasites, which appear to be specifically distinct, might fairly be urged as an argument that the races themselves ought to be classed as distinct species.
Our supposed naturalist having proceeded thus far in his investigation, would next inquire whether the races of men, when crossed, were in any degree sterile. He might consult the work9 of a cautious and philosophical observer, Professor Broca; and in this he would find good evidence that some races were quite fertile together; but evidence of an opposite nature in regard to other races.
9 'On the Phenomena of Hybridity in the Genus Homo,' Eng. translat. 1864."]