Cornsfioiii/i III I ir'illi ('/ntr/i -^ Ihiium 



1H9 



to Im- cniiviricMHi I lull till- oliMcuiily wiim nil in my licml, Imt I cuiiiint tliiiik wi, fur ii cUwr 

 lii'iuli'tl (fIciiiiT tliiiM I iim) iu<>iiil)(>r of my family ri-nil tho iirticli- nml wit-* i\s much puaulfd an 

 I wius. To this miiiult^ I caiiiiot. dftiiif whiit arii "dcvj-lopt-d," "Ht<irilo'' mid "fortilo" ({CTms. 

 You arc II rt'ai Clii'i.Htiaii if you do not hatu nic for ever and ever, 



I Khali try you when wo comi- to I>iiidon in a month or six w»H>kH time, an 1 want U» a»ik 

 a iiucxtiiin hIhhii hvitil m's, wliii'h ciiii Iw askisl in a minute or two, hut would till n long Iett4-r. 



Yours very sincerely, Ca. Darwin. 



P.S. As .soon :i.s 1 am suiv tliat no more potis of Swwt Ppbh will ripttn, I will send all the 

 haj^ in a Ik)x per Ilailway to you. 



42, Rutland Gatk, 8.W. Nov. 26/75. 



Mv KKAU I>AiiwiN, How call I thank you sufticiontly for the trouble y/)U have taken with 

 the peas, whicli arrived last night in heautiful order. You must let me know, when we next 

 meet, if there \k anything I owe you for payments of any kind connected with them; Will you, 

 in the meantime, give the enclostnl 10/- (I send an order mmle out in your name) to the 

 gardener from me? and tell him that I am much obliged for his care. 



Ever yours, Francis Oalton. 



Romanes has told me much of his wonderfully interesting results with the Medusae. 



Dec. 18th [1875] (Homo on Monday). 



Mv DEAR Oalton, (.itnirge iios lxH>n explaining our differences. I have admitUnl in new 

 Edit, (before seeing your essay) that perhaps tiie gemmules are largely multiplie<l in the reprt>- 

 ductive organs; but this dm's not make me doubt that each unit of the whole system also sends 

 forth its gemmules. You will no doubt have thought of the following objection to your view, and 

 I should iike to hear what your answer is. If l! plants an? cros.Hcd, it often or rather generally 

 happens that every part of stem, leaf — twen to the hairs — and flowers of the hybrid are inter- 

 nuHliate in chai-acter ; and this hybrid will produce by buds millions oti millions of other buds 

 all exactly repiXKlucing the intermediate character. I cannot doubt that every unit of the 

 hybrid is hybridised and sends forth hybridised gemmules. Here we have nothing to do with the 

 rt^priKluctive organs. There can hardly !« a doubt, from what we know, that the same thing 

 would occur with all tho.se animals which are capable of budding and some of those (as the 

 compound Ascidians) are sufficiently complex and highly organised. 



Yours very sincerely, Ch. Darwin. 



42, Rutland Gatk. Dec. 19/75. 



My deak Dahwin, The explanation of what you propose does not seem to me in any way 

 (lifFenint on my theory, to what it would Ik; in any theory of organic units. It would be this: 



IjCt us deal with a single ([uality, for clearne.ss of explanation, and suppose that in some 

 particular plant or animal anil in some particular structure, the hybrid between white and black 

 forms was exactly intermediate, viz: grey — thenceforward for ever. Then a bit of the tinted 

 .structure under the microscope would have a form which might be di-awn as in a diagram, as 

 follows: — 



Hiite Porm. Black ?orm« 



e:^ 



^Sm^tor 



whereas in the hybrid it would be either that some cells were white and others black, and 

 nearly the .sjvme pn>portion of each, as in (1) giving on thi' whole when less highly magnified a 



(mrpc:>(^Q0 



(1) (2) 



uniform grey tint, — or else as in (2) in wliich each cell had a uniform grey tint. 



