Summary

Thanks THH for his response on glacial movement. Hopes Tyndall will experiment on broken ice and explain how two pieces of ice can freeze together.

Sorry to hear of THH’s row with Richard Owen.

Summary

Agassiz’s superficiality and wretched reasoning powers. But he stirred up Europe on glaciers. Lyell has been working on their effects – testing work of others.

CD believes "Natural Systems" ought to be simply genealogical. "Time will come when we shall have true genealogical trees of each great kingdom of nature."

Summary

Thinks naturalists look for something further than Cuvier’s view of classification. Poses a theoretical problem on the classification of the races of man to prove that a genealogical system is best.

Summary

Thanks for Catalogue.

Has had a bad month. Somewhat improved as a result of John Chapman’s ice-bag cures.

Asks THH to read MS on his hypothesis Pangenesis. THH only man whose judgment on it would be final with him.

Summary

Thanks THH for his cautionary response on Brullé, but departs from THH in thinking that Barnéoud, if true, would shed light on Milne-Edwards’ proposition that the wider apart classes of animals are the earlier they depart from common embryonic plan.

Summary

Asks THH’s opinion on embryological views of G. A. Brullé [Ann. & Mag. Nat. Hist. 13 (1844): 484–6] and F. M. Barnéoud [Ann. des Sci. Nat. ser. 3, Bot. 6 (1846): 268–96] and on Milne-Edwards’ classification.

Has been reading John Goodsir ["On the morphological constitution of the skeleton of the vertebrate head", Edinburgh New Philos. J. 2d ser. 5 (1857): 123–78].

Has embryology of bats ever been worked out?

Summary

Grateful for Siebold’s wonderful facts [C. T. E. von Siebold, On a true parthenogenesis in moths and bees (1856), trans. by W. S. Dallas (1857)].

Vitality of spermatozoa.

Hybridisation of bees. Bees are in one respect his greatest theoretical difficulty.

CD still convinced about the relation of cement receptacles and ovarian tubes [in Crustacea].

Birth of C. W. Darwin.

Summary

THH’s catalogue [THH and R. Etheridge, A catalogue of the collection of fossils in the Museum of Practical Geology (1865), part published in 1857] best résumé he has seen of science of natural history. On classification he is not quite sure that he wholly goes along with THH. Encloses a few criticisms of THH’s preface.[enclosure survives as copy only].

Summary

Approves drawing. No one who cannot draw should attempt to be a naturalist. Suggests corrections to [Lepas?] drawing. Comments on position of ganglia, cement glands, and stomach.

Summary

Thanks for Lectures on the elements of comparative anatomy [1864].

If Owen wrote article on "Oken" [Encyclopaedia Britannica, 8th ed.] and French work on archetype he never did a baser act [see ML 1: 246 n.].

Bad health lately.

Summary

Congratulations on birth of THH’s daughter [Jessie].

On aboriginal dun colour of horses.

Examples of inaccuracies and perpetuation of errors [on hybrids] by "compilers, of which I am one".

Summary

Congratulates THH on first number of Natural History Review.

THH’s article on brain ["On the zoological relations of man with the lower animals", Nat. Hist. Rev. (1861): 67–84] completely smashes Owen.

Owen’s Leeds address [Rep. BAAS (1858): xlix–cx].

In his historical sketch of opinion on species CD has picked out some sentences [by Owen] with which he will take some revenge. CD is not bold enough to come to an open quarrel.

Summary

Asks THH question on flow of glaciers after ice has been fractured and fragmented.

CD had to leave Royal Society lecture [joint paper by THH and J. Tyndall, "On the structure and motions of glaciers", Philos. Trans. R. Soc. Lond. 147 (1857): 327–46] before the end because of headache.

Summary

Pleased by what THH says on cement glands and organs in higher Crustacea. Content to be moderately right.

Hopes THH will dissect the Conchoderma.

Asks for cases of organs in which there is no apparent transition from other organs or in which transition can be shown in an unexpected way and for instances of odd and inexplicable connections between parts, such that if one part varies the other varies also.

Summary

Thanks for THH’s examples of serially modified and homologous parts in Radiata. Cannot understand how he forgot such cases.

Agassiz’s Essay on classification [1859] utterly impracticable rubbish.

Summary

News of K. E. von Baer’s support is magnificent – far outweighs Owen and Agassiz. Asks THH to tell Baer that a statement from him would be of utmost value.

R. Wagner [in an article on Louis Agassiz’s principles of classification, Göttingsche gelehrte Anzeiger (1860) pt 2: 761–800] "goes half way" between Agassiz and Origin.

Summary

Thanks for help on presentation copies of Living Cirripedia, vol. 2.

Suggests he examine cementing apparatus of Balanus.

Summary

On THH’s paper on cephalous Mollusca [Philos. Trans. R. Soc. Lond. 143 (1853) pt 1: 29–66]. Discovery of the type or "idea" (in THH’s sense, not Owen’s or Agassiz’s) is one of the highest ends of natural history.

Discusses anamorphism;

position of heart in Cleodora.

Variability within species;

cementing process in cirripedes.

Summary

It seems improper that his advances to G. B. Sowerby Jr for payment of engravings should not have been mentioned to Council of Ray Society. His appreciation of the Society.

Summary

Glad THH has taken up aphid question versus Owen ["On the agamic reproduction and morphology of Aphis", Trans. Linn. Soc. Lond. 22 (1858): 193–236].

Fertilisation and inheritance discussed. Speculates that fertilisation may be a mixture rather than a fusion. Can understand in no other way why crossed forms tend to go back to ancestral forms.