Hybrids of Phasianus versicolor breed freely between themselves as well as with common pheasants. Has been assured that hybrids between mallards and pintails are sometimes fertile inter se.

Discusses theory of submerged continental extensions. Objects that if it is applied to one island, it must be applied to all. Admits that some volcanoes may have been associated with subsidence, in contrast to his former view. Cites evidence from S. American Cordillera. Doubts that elevation associated with volcanoes is merely local, and that great ocean areas are necessarily sinking.

Says he will make his essay [on species] as complete as possible and will discuss CL’s Principles.

CD cannot swallow continental extensions. Has written to Lyell giving a lengthy criticism of the concept [see 1910] and has asked Lyell to forward the letter to JDH.

Perhaps Aristolochia and Viscum are protandrous.

Troubled by JDH’s connection between Antarctic island flora and Fuegia, which CD sees as part of a general relation to southern circumpolar flora. Encloses list [not found] of plants from Tristan d’Acunha.

Thanks CL for loan of [Matthew Fontaine?] Maury’s map.

Discusses possibility of submerged continental extension including Madeira, Canaries, and Azores.

Mentions icebergs as carriers of European plants.

Hooker’s work on Antarctic flora.

Comments on coolness of tropics in glacial period and consequent migrations. Hooker’s views on this.

CD writing species sketch; must cite cases favouring multiple creations.

Requests details on species JDH listed as common to Chile and New Zealand. Notes their genera are mundane.

Will use Boltenia case cautiously, if at all.

Polyzoa.

Bisexualism in Flustra and Ascidia.

[T. Bell Salter’s?] "hybrid" Epilobium a false claim.

Admires Huxley’s response to Falconer [see 1904].

Tristan da Cunha plant list, requested by CD, supports JDH’s position [on continental extension?].

Chilean plants not exceptional.

JDH considers parallels between Australian Alps and European plants strong evidence for multiple creations.

Has found no case of Huxley’s eternal hermaphrodites.

Cruelty and waste in nature.

CD does not believe in hybrids.

One proven case of multiple creations would smash CD’s theory.

Asks JDH to read MS on alpine and Arctic distribution.

Lyell’s "conversion" to mutability.

Asks whether the blind cave animals described by B. Silliman Jr [Am. J. Sci. 2d ser. 11 (1851): 332–9] belong to genera found only on the American continent.

On geographical distribution of Crustacea, CD asks whether northern genera sent species to the Southern Hemisphere or did southern genera send species north?

Does he know of any author who has described fossil trees in South Shetland Islands?

Asks whether Allegheny Mountains are sufficiently continuous so that plants could travel from north to south along them.

Hopes AG’s work on geographical distribution is progressing, as he has questions on plants common to Europe which do not range up to Arctic.

Are intermediate varieties less numerous in individuals than the varieties they connect?

Has reduced 20 Cyrena species to geographical varieties of one species, Cyrena fluminalis. Hooker is reducing Indian flora at the rate of 19 to 1.

Recommends W. H. Harvey’s Seaside book [1849] and Charles Pickering’s Races of man [1850].

Lists Lusitanian shells with wide ranges beyond that geographical province.

Antiquity and elevation of land mass is more important than latitude for the distribution of shells.

Responds to CD’s questions about the geographical distribution of freshwater fishes.

Recommends W. B. Carpenter’s paper on Foraminifera, pt 2, be published in Philosophical Transactions [R. Soc. Lond. 146 (1856): 547–69].

Thanks for information about variability in shells.

Comments on Harvey’s Seaside book [1849].

"I am growing as bad as the worst about species and hardly have a vestige of belief in the permanence of species left in me".

Multiple creations.

Necessity for crossing in plants and animals: JDH to take up the subject; explains separate sexes in trees.

Continental extensions.

CD’s predicament with continental extensions: they would remove argument for multiple creations, yet he opposes the doctrine. Lyell will not express an opinion on this.

Lyell fears mutability would lead to more specific names.

Encloses copy of letters to Lyell [1910 and 1917].

Believes intermediate varieties are generally less numerous in individuals than the two states that they connect.

Discusses the difficulties of deciding what is the typical form of a species

and gives some opinions on the variability of introduced species compared with indigenous species.

Is collecting only pigeons that differ in proportions, so declines some birds offered by WBT.