Comparison of skulls of Ichthyosaurus and Cetacea.

Thanks THH for corroborating his observations. Discusses metamorphosis of ovaria to cement organs. Ovaries, germinal vesicles, and anatomy of cirripedes. Difficulties of classification, and observation.

THH’s article on Mollusca [Charles Knight, ed., English cyclopædia: a new dictionary of universal knowledge (1854–70) 3: 855–74].

Acknowledges a list [of plants?].

Looks forward to new edition [of British plants growing wild in the parish of Hitcham, Suffolk, 2d ed. (1855)].

JSH should not trouble about Anacharis until he is less busy. Will send cirripedes.

JDH criticises C. J. F. Bunbury’s paper on Madeira [J. Linn. Soc. Lond. (Bot.) 1 (1857): 1–35].

Absence of Ophrys on Madeira suggests to JDH a sequence in creation of groups.

Why are flightless insects common in desert?

Australian endemism.

Can AH give information about D. A. Godron, "De l’espèce et des races" [Mem. Soc. Sci. Lett. & Arts Nancy (1847): 182, 239–88]? CD unable to locate reference.

CD has been a referee for LH’s Nile geology paper [Philos. Trans. R. Soc. Lond. 145 (1855): 105–38]. Praises the work but offers criticism not in his report: Joseph Russegger’s statement about the baked Upper Sandstone deposit cannot be believed; LH’s paper is too long.

Asks WDF to observe at what age pigeons have tail-feathers sufficiently developed to be counted.

CD is hard at work on his notes for a book with all the facts "for & versus" the immutability of species.

Asks for a young chicken and a nestling common pigeon.

Recommends publication of Leonard Horner’s account of researches in alluvial deposits of Egypt [Philos. Trans. R. Soc. Lond. 145 (1855): 105–38]. It contains valuable observations which will probably become of still higher value in future.

CD hopes to have an hour’s talk with CJFB before CD leaves London.

On the ova of the salmon in relation to the distribution of species.

Will forward JD’s paper to the Royal Society ["On the ova of salmon", Philos. Trans. R. Soc. Lond. 146 (1856): 21–9].

Discusses JD’s paper ["On ova of salmon"]. His experiments are of particular value regarding power of dispersal and geographical distribution and would make of them a very different subject. Hopes JD can test again the tenacity of life of non-developed ova being less than that of those fully developed – a result which surprised CD.

Thanks JSH for Anacharis which is flourishing.

P. H. Gosse told him he had several sea animals and algae living in artificial sea-water for over 13 months.

Thanks WDF for his offer of assistance in collecting varieties of poultry. Describes his needs. He will raise his own pigeons.

Often doubts whether, despite all help, the problem of species will not overpower him.

Requests HM’s article in the Witness [24 Feb 1855; see HM, "On the late severe frost", Proc. R. Phys. Soc. Edinburgh 1 (1854–8): 10–14], on the effects of frost on shells. CD expresses admiration for the two works by HM he has read.

Thanks AH for seeking reference. If AH cannot find Godron [see 1648] it is hopeless. Thanks for reference to C. F. Hornschuch.

Thinks J. O. Westwood deserves Royal Society’s Gold Medal. Asks THH’s opinion of his nomination. Lyell deserves Copley Medal, but, since he has Royal Medal, it may be objectionable to propose him.

Asks for a pea variety for an experiment.

Discusses C. F. v. Gärtner’s results [in Bastarderzeugung im Pflanzenreich (1849)]. Criticises Gärtner’s belief that hybrids are always less fertile than their parents.

Asks about MJB’s experiments.

CD has begun seed-salting experiments. Wants JDH to write which seeds he expects to be easily killed [in salt water].

CD’s idea that coal-plants lived in salt water like mangroves made JDH savage.

Responds to CD’s questions about mountain vegetation of the Cape of Good Hope. The distribution of some plants provides problems for both migration and special creation hypotheses.