Harvey's letter (103/2. W.H. Harvey had been
corresponding with Sir J.D. Hooker on the "Origin of Species."), which
I will keep a little longer and then return. I will write to him and
try to make clear from analogy of domestic productions the part which I
believe selection has played. I have been reworking my pigeons and other
domestic animals, and I am sure that any one is right in saying that
selection is the efficient cause, though, as you truly say, variation
is the base of all. Why I do not believe so much as you do in physical
agencies is that I see in almost every organism (though far more
clearly in animals than in plants) adaptation, and this except in rare
instances, must, I should think, be due to selection.

Do not forget the Pyrola when in flower. (103/3. In a letter to Hooker,
May 22nd, 1860, Darwin wrote: "Have you Pyrola at Kew? if so, for
heaven's sake observe the curvature of the pistil towards the gangway to
the nectary." The fact of the stigma in insect-visited flowers being so
placed that the visitor must touch it on its way to the nectar, was a
point which early attracted Darwin's attention and strongly impressed
him.) My blessed little Scaevola has come into flower, and I will try
artificial fertilisation on it.

I have looked over Harvey's letter, and have assumed (I hope rightly)
that he could not object to knowing that you had forwarded it to me.

LETTER 104. TO ASA GRAY. Down, June 8th [1860].

I have to thank you for two notes, one through Hooker, and one with
some letters to be posted, which was done. I anticipated your request by
making a few remarks on Owen's review. (104/1. "The Edinburgh Review,"
April, 1860.) Hooker is so weary of reviews that I do not think you
will get any hints from him. I have lately had many more "kicks than
halfpence." A review in the last Dublin "Nat. Hist. Review" is the most
unfair thing which has appeared,--one mass of misrepresentation. It
is evidently by Haughton, the geologist, chemist and mathematician.
It shows immeasurable conceit and contempt of all who are not
mathematicians. He discusses bees' cells, and puts a series which I have
never alluded to, and wholly ignores the intermediate comb of Melipona,
which alone led me to my notions. The article is a curiosity of
unfairness and arrogance; but, as he sneers at Malthus, I am content,
for it is clear he cannot reason. He is a friend of Harvey, with whom
I have had some correspondence. Your articl