No summary available.
No summary available.
Gives CD a reference to one of his papers ["Remarks on the modes of variation of nearly affined species or races of birds", J. Asiat. Soc. Bengal 19 (1850): 221–9]
and discusses moulting in birds.
Quotes instance of an action by an elephant that apparently displays considerable intelligence.
No summary available.
Comments on the quality of some of the double star observations in print.
Gratitude for JH's generous testimonial on RM's behalf.
Discusses Lord [Henry ] Brougham and his optical papers. Thanks ES for kind remarks regarding JH's son [John?]. Discusses polarization of corona.
Feels there is little he could say as a testimonial for HMJ.
Thanks for proofed pages. Received Astronomische Beobachtungen auf der Sternwarte zu Bonn. Finished determining by electric means the different observational longitudes of Leiden and Brussels.
Observations on lateral spots on coats of two specimens of deer. PS on habits of wild and domestic turkeys.
Bibliographical references on [stridulation in] Coleoptera. Finds no idea of sex has occurred to authors [i.e., they do not find the stridulating organs differing according to sex; cf. Descent 1: 378–85].
Thanks JH for information regarding Henry Brougham [see ES's 1868-9-29 & 1868-10-8]. Also for comment on polarization of aurora. Encloses Captain [John?] Hay's letter, but not plate.
No summary available.
Encloses copy of H. Barkly’s answer to JDH’s inquiry on the Seychelles Island crocodile.
Replies to CD’s questions on sexual differences in birds.
Sexual differences in coloration. Sexual selection versus natural selection as explanations. ARW continues to argue against sexual selection, saying that natural selection, in keeping the female dull for protection, would account for differences in sexual colouring more effectively than inheritance and partial transmission of sexually selected male colours. Colours of female birds of paradise. Protective coloration. Disagrees with CD on coincidence of hidden nests and bright colours of females.
No summary available.
No summary available.
A sermon.
Thanks JH for his pamphlet on musical scales.
Note identifying insects and remarking on stridulation.