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Sending some tables to show the relation between the mean distances of the primary and secondary planets.
The Meteorological Committee of the R.S.L. is about to commence publishing the summary of the observation collected from the seven observatories. Would like JH's advice on method of publishing the barometric observations.
It was a great pleasure to receive JH's letter. Sees that he still remembers the day at Portsmouth. Hopes to collect and publish her father's letters and now returns those written to JH.
Thanks JH for the memoirs he sent to CP, who will reciprocate with some of his own.
Notices in letter of last May JH's postscript about the rate of color blindness occurring to overworked or ill artists, and doubts it becomes di-chromic, but merely a 'weakness' of vision.
Desires advice on construction of glass prisms for Newtonian reflecting telescopes. Also asks how to test the parabolic figure of a glass speculum before silvering.
Has made the changes JH suggested. Autobiography will be published posthumously. Met [Henry W.] Longfellow. Wishes the Herschels would visit because it might improve JH's health.
Suggests remedy for bronchitis problem in JH family. Young John Herschel's work on nebulae pleases CP. Comments on William Huggins's work on solar spectra.
Has discovered William Herschel's memoirs in R.A.S. library; arranged and read them. Asks JH whether any copies exist so the originals can be checked for completion before binding. Questions JH on William Herschel's opinion of the nature of nebulae and boundaries of the galaxy.
Would be pleased if JH would come to the consecration of the new chapel in May.
Consulted A. C. L. G. Günther, museum ichthyologist. Answers JH's question about poisonous herring Clupea thryssa. [A. K.] Johnston's Physical Atlas attributes Ruminants article to GW, but GW wrote only Rodentia article.
Extensive discussion of comparative anatomy, taxonomy, and distribution of rodents. Encourages JH to use term Hystricidae for porcupines in JH's [Physical Geography (1861)].
Reptile genera in JH's [Physical Geography ] are consistent with those of [Edward] Forbes cited in Johnston's Physical Atlas [1854], but new genera have been discovered. Questions JH's claim that Elgin sandstone is Devonian. Notes Richard Owen's estimates on pterodactyl size, and distinct tail feathers [illustration] on recent specimen from Bavaria. Corrects JH's names for beaver genera.