Thanks for AG's review of Forms of flowers [Am. J. Sci. 3d ser. 15 (1878): 67–73].
Thomas Carlyle's letter about CD was a forgery.
Gives Hermann Müller's observations on Valeriana dioica.
Is unsure about function of "bloom"; are glaucous plants more or less common in arid parts of U. S.?
Observations on heliotropism.
Thomas Meehan reports that Linum perenne is self-fertile; CD thinks that he has mistaken the species.
Down, | Beckenham, Kent. | Railway Station | Orpington. S.E.R. [London]
My dear Gray
I received 2 or 3 days ago your review of my Forms of Flowers, which
has pleased & as usual instructed me much. I was specially pleased at my
suggestion of giving names to the subdivision of polygamous plants being approved of by
you.— Thanks, also, for the review of M
Could you not get some young man to experiment on & observe grades of fertility of Epigæa & Rhamnus. &c. Herman M¨uller describes Valeriana dioica as consisting of 4 analogous forms. He attributes their case primarily to the existence of 2 forms, one with larger & the other with smaller corolla, such as he has shown exist in other cases; but his German was obscure, & I could not follow the further supposed transformations.
I hope that you have got over the first great press of accumulated work & are now not so much overworked. I hope tomorrow to see Hooker, for I am writing this in London, to which place I have come for a few days rest after working rather too hard.
My son Frank & I have been observing the autonomous movements of seedlings & those due to Heliotropism, which latter from their complexity have almost driven us mad.
We have made out something, but not very much about the uses of bloom or the waxy secretion on the leaves & stems of plants. Did you notice whether such glaucous plants are more or less common in the arid countries to the west or centre than in the more humid districts on the Atlantic?
You know my opinion of all American ladies, so you will believe how delighted we have been at my son marrying Sara Sedgwick— She is in every possible way quite charming.
Yours affectionately | Ch Darwin
I forgot to add the following as I wished to do yesterday. M
I have just spent a delightful 2 hours at Kew, & heard prodigies of your strength & activity. That you run up a mountain like a cat!