My dear Sir,

I take pleasure in sending you an article of mine, briefly summatory of the main causes of decline in the Hawaiian population.¹ It contains little or nothing that is new; but it seems to me that the intellectual perturbation of savages under civilization, as a possible cause of their infertility, has not yet, perhaps, been sufficiently studied.

Let me say that I am in frequent correspondence with my father, the Rev. Titus Coan of Hilo, & that he would be happy to answer, either directly or through me, according to the best of his observations, any questions about the Islanders that you might take interest in asking.²

Very sincerely yours, | T. M. Coan.

Dr. Charles Darwin.