Dear Sir: On arriving here last week, I found the December livraison of your Biology, and I need hardly say how much I regretted the announcement in the paper annexed to it.. . . I propose that you should write the next of your treatises, and that I should guarantee the publisher against loss.. . . I beg that you will not consider this proposal in the light of a personal favor, though even if it were I should still hope to be permitted to offer it. But it is nothing of the kind—it is a simple proposal of ;coöperation for an important public purpose, for which you give your labor and have given
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