Down, Beckenham, Kent: July 12, 1875. I am correcting a second edition of 'Var. under Dom.,' and find that I must do it pretty fully. Therefore I give a short abstract of potato graft hybrids, and I want to know whether I did not send you a reference about beet. Did you look to this, and can you tell me anything about it? I hope with all my heart that you are getting on pretty well with your experiments; I have been led to think a good deal on the subject, and am convinced of its high importance, though it will take years of hammering before physiologists will admit that the sexual organs only collect the generative elements. The edition will be published in November, and then you will see all that I have collected, but I believe that you saw all the more important cases. The case of vine in 'Gardeners' Chronicle' which I sent you I think may only be a bud-variation, not due to grafting. I have heard indirectly of your splendid success with nerves of Medusæ. We have been at Abinger Hall for a month for rest which I much required, and I saw there the cut-leaved vine, which seems splendid for graft hybridisation. Yours very sincerely, CH. DARWIN. _To C. Darwin_, _Esq._ Dunskaith: July 14, 1875. I was very glad to receive your letter, having been previously undecided whether to write and let you know how I am getting on, or to wait until I got a veritable hybrid. In one of your letters you advised me to look up the 'beet' case, but I could nowhere find any references to it. Dr. Hooker told me that although he could not then remember the man's name, he remembered that the experimenter did not save the seed, but dug up his roots for exhibition. I forget whether it was Dr. Masters, Bentham, or Mr. Dyer who told me that the experiment had been performed in Ireland, although they could not remember by whom. But if the experimenter did not save the seed, the mere fact of his sticking two roots together would have no bearing on Pangenesis, and so I did not take any trouble to find out who the experimenter was. As you have heard about the Medusæ, I fear you will infer that they must have diverted my attention from Pangenesis; but although it is true that they have consumed a great deal of time and energy, I have done my best to keep Pangenesis in the foreground.