I should like to write an essay on species some day; but before I should have time to do it, in my plodding way, I hope you or Hooker will do it, and much better far.

I am most glad to be in conference with Hooker and yourself on these matters, and I think we may, or rather you may, in a few years settle the question as to whether Agassiz's or Hooker's views are correct; they are certainly widely different.
Apropos to this, many thanks for the paper containing your experiments on seeds exposed to sea water.

Why has nobody thought of trying the experiment before, instead of taking it for granted that salt water kills seeds?
I shall have it nearly all reprinted in "Silliman's Journal" as a nut for Agassiz to crack.
LETTER 325.

TO ASA GRAY.

Down, May 2nd [1856 ?] I have received your very kind note of April 8th.