CorrexjMiHfli-nrc irith C/iarh-« Darwin 169 



l>r Carter to lubvl awl Minul all particulars with theui and tu nmrk Uieir backtt with big 

 nuiiiertils in ink. Tlin carriur sliould call at Uitivrrxity C'ullc^i- for thuiu, asking the purter at 

 th(^ gate. T enclose a papor for him. Oiico iigaiti, with siiiii-ri' thanks, 



Ever yours, Pravciii Oaltow. 



T have just corroctcil prixif.s of a little pii(XT to Ix- shortly read at tlu" Koyal Society on 

 "mo<Kl-relationship" in which I try to defiuH what the kinnhip really is, Imtwi-*"!! (mrentM and 

 their ott'Nprin^. 1 will sojid a copy when I have one ; it may interest you. 



42. Rutland Oatr, S.W. .Hay 29 72. 



Mv DEAR Darwik, May I lunch with you on Tluinwlay and arranRft alnjut rabhitat We 

 shall then lx< stayiiif? for 2 days in your neighbourhixxl at Mrs Brandrani, Hayes C^nnmoii. 



Your letter reache<l me just l)eforo we wen? leaving town for a Haturday and Sunday viMit, 

 and I did not reply at once, waiting to be sure about our engagements. If I don't receive a 

 post card at al)ove address to say 'no,' I will coma Ever sincerely y(»ur», Francis Galton. 



The spiritualists liave given me up, I fear. I can't get another invite to a stance. 



42, Rutland Oat«, S.W. Juw i/T2. 



.Mv iiKAit Dakwiv, Thank you very much aVxmt the rabbits. T however sincerely trust 

 you did not sj'ud your man all the way on purpose for them alone ! Anyhow I feel I have put 

 you to much trouble and e^n only repeat how greatly I am obliged. 



Your criticisms on my paper are very gratifying to me, the more so that the question yon 

 put is on(! to which I can at once reply. You ask, why hybrids of the first generation are 

 nearly uniform in character while great diversity app<'ars in the grandchildren and succeeding 

 generations'? 1 answer, that the diagram shows (see next jiage') that only 4 stages separate 

 the children from the parents, but 20 from their grandparents and therefore, judging from 

 these liniit<Hl data alone, (ignoring for the moment all considerations of une<|iial variability in 

 the different stages and of pre-potence of particular qualities etc..) the incn^ase of the mean 

 deviution of the several grandchildren (from the average hybrid) over that of the several 

 children is as \/20: or more than twice as great. The omitted considerations would make the 

 deviation (as I am prepared to argue) still greater. 



I will mid the explanatory foot-note you most justly suggest, and should be very glad if 

 you would let me have your i-opy back (T will return it) with marks to the obscure piiaBages 

 that I may ti-y to amend them. 



I found the [? writing] an uncommonly tough job; having to avoid hyp>the.sis on the one 

 hand and truism on the other and, again, the difficulty of being sutliciently general and yet not 

 too vague. Tt is very difficult to dniw a correct verbal picture in mezzo-lint, I mean by burnish- 

 ing out the broad efTects and not by dnisviiii,' bard outlines. 



Ever very sincerely yours, Francis Galton. 



I have knocke<l every .symlwl out of my paper and wholly rearranged the diagrams etc., to 

 make it le«.s unintelligible. F. G. 



A pleasant journey and rest to you all ! 



flaltoti's {);i])er wius read at tlie Royal Society on June 13th of this year, 

 and we now turn to its examination. 



We have seen (p. 114) that Galton as early its 18(59 uronotinded a 

 doctrine e<]uivalent to the continuity of the germ-plasm ana tne non-in- 



' In AiiivKilt and PlanU under Dom««linUiott, Ist Edn. 18()8, p. 400, Darwin writes 

 "Crossed Forum are generally at first int«irmediate in character between their two parents; 

 but in the next generation the offspring generally revert to one or both their grandparents, and 

 occjusionally to more remote ancestors." He then proceeds to explain this by latent geramules, 

 and had he lioen a statistician could have de<luce<:l at once a Mendelian quarter! He points out 

 the triple character of the sectjnd genenvtion of hybrids distinctly. 



' 1 omit the diagram, as I have failotl to interpret it and then-fore cannot tran.Hcril»e it 

 properly. 



p o u W 



