Believes JDF’s discoveries in the structure of glacier ice will explain the structure of many volcanic masses. Will JDF’s views throw any light on the primary laminated rocks?

GP prefers to meet on Saturday at Somerset House, rather than on Friday as JH proposed.

No summary available.

Changing a date of meeting for the magnetic committee of the B.A.A.S., and inviting GA to be there.

Asks HL for comments about the question of continuing the magnetic observations.

[Form letter] Asks recipients to consider value of magnetical research supported by British government and submit opinions on whether B.A.A.S. should seek continuation of this support after present agreement with government expires at end of 1845.

Sorry that WW cannot go to London to meet [with the magnetic committee]. Regrets missing JH at York B.A.A.S. meeting.

JH has forgotten to name the day of his arrival. Can he let Elizabeth Baily know? Thinks he did the right thing in staying at Tavistock Place.

Is publishing a work on rare atmospheric phenomena. Lists names of persons who have assisted with observations. Would like to inscribe the book to JH.

Accepts JH's invitation to attend the meeting [see JH's 1844-11-1], and offers JH accommodation for the night.

Thanks GA for offer of accommodation [see GA's 1844-11-2], but JH says he must stay with Miss [Elizabeth] Baily at Tavistock Place.

Observed Comet Mauvais. Is grateful for JH's intervention on Observatory matters. Extra Meridian Instruments defective. Continues observations of variables. F. E. Wilmot's land survey cancelled. Magnetic survey progressing. Mary Maclear ailing.

Not acquainted with proposal by A. T. Kupffer. Replies to queries by B.A.A.S. committee regarding continuation of magnetic and meteorological observatories. Expects self-registering instruments to supersede human observers soon.

Discusses HD’s information that same species of birds at remote stations have identical parasites. Urges him to investigate N. American land-bird parasites.

Is deeply interested in everything connected with geographical distribution, and the differences between species and varieties.

Outlines the recent activities connected with the magnetic survey of the Cape and comments on the progress. Gives details of difficulties under which Thomas Maclear works at the Cape Observatory.

Sends notes on Infusoria for Ehrenberg.

Comments on distribution of species in natural orders that have local distributions. Intermediate forms between species of Lycopodium.

Sends actinometer observations of 1841 and 1842, which he will publish. Asks JH to look them over and make comments.

Origin of Antarctic brash ice.

Further on case of Lycopodium: does JDH know any genera of plants whose species are variable in one continent but not in another? Discussion on variations between floras as regards species richness, and factors affecting geographical distribution. On species, CD expects "that I shall be able to show even to sound naturalists that there are two sides to the question of the immutability of species; – that facts can be viewed and grouped under the notion of allied species having descended from common stocks". Mentions books and papers for and against species mutability. CD believes past absurd ideas arose from no one’s having approached subject on side of variation under domestication.

Would like to see Clarke’s paper

and would welcome visit from JDH.

Discusses ES's experiments with convertible and travelling pendulums. Asks how 'für vaterländische Cultur' is to be translated for the list of societies.

Sends papers and new book on 'Chemical influence of Light' by JD. Received JH's papers. Apologizes for failing to give JH discovery credit. Notes on light interference.