When you get my sheets of first part of article in "Silliman's Journal," remember that I shall be most glad of free critical comments; and the earlier I get them the greater use they will be to me...
One more favour.

Do not, I pray you, speak of your letters troubling me.
I should be sorry indeed to have you stop, or write more rarely, even though mortified to find that I can so seldom give you the information you might reasonably expect.
LETTER 329.

TO ASA GRAY.

Down, August 24th [1856].
I am much obliged for your letter, which has been very interesting to me.

Your "indefinite" answers are perhaps not the least valuable part; for Botany has been followed in so much more a philosophical spirit than Zoology, that I scarcely ever like to trust any general remark in Zoology without I find that botanists concur.