Is grateful for the handsome manner in which JH has acknowledged RH's work. Would be willing to prepare a memoir for the R.S.L. Does Louis Daguerre's patent affect RH's manufacture of photographic papers? Has not studied the bromnets so far, but has studied the effects of bromine on plates. Comments on his results.

The packing and shipping of goods to Collingwood is complete; JH will now attend to a few final details and then come to Collingwood, having spent the most horrible 'fortnight in my life.'

Has received materials from [A. D.] Bache indicating that the U.S. government has proposed to establish 5 magnetic observatories.

Mostly about damage to furniture during shipment from Slough to Collingwood.

Hopes [Humphrey] Lloyd will reconsider V.F. Magnetometer based on JH's remarks. Discusses Canadian observatories. States who will perform U. S. magnetic survey. Discusses micrometer use.

When the case containing the stand of the telescope was opened it was found to contain a number of books. Were these intended for the R.A.S. or should they be returned to JH?

Asks JH's advice in establishing new astronomical, meteorological, and magnetic observatory at Harvard University. Describes instruments already owned and those ordered from Europe.

Writes of a magnetic survey of a portion of India and the inaccuracy of the equipment used in magnetic observations at sea.

Waxes lyrical about nature, and comments on a new 'positive' paper JH has sent. Refers to JH's move to Hawkhurst.

R.S.L. Council approved publication of ES's paper on magnetic observation at sea. Discussions for North American magnetic observatories continue.

Thanks for excellent pictures WT sent. JH wishes JH had time for further experiments, especially on the 'thermic spectrum.' Praises [Robert] Hunt's results. Recommends experiment to WT.

Would FB deputize for him at the council meeting on Friday as he is unable to attend. Letter from F. W. Bessel regarding 61 Cygni. Has written to G. B. Airy regarding Thomas Maclear's paper.

Sends his paper for communication to the R.S.L. Will send some more examples later as his camera has developed a defect.

[John] Lefroy should replace [Charles] Riddell in Canada. Discusses proposed Norwegian observatory and proposals for various instruments. Navy officers may be helpful observers in colonies.

Just moved [to Collingwood]. Will send information about ED's late son, Thomas Drummond. Recalls Drummond's fame and triangulation work on Irish Survey. Describes invention and first demonstration of Drummond Light.

Will forward RH's paper to the R.S.L.; intrigued by RH's results using mercury vapor to produce the image on exposed paper.

Thanks for series of portraits of members of Ipswich Museum.

Returns the photographic drawings of W. H. Fox Talbot with many thanks. Fears for their permanence. Has produced similar pictures himself acting on bromide of silver with hydrocholoric acid. Has had trouble with his periscope lens.

Has a problem with the explanation of interference bands produced by mica being placed between the eye and prism-produced dispersion; the explanation is Baden Powell's.

Writes to supply GA with an address for a reply to JH's 1840-5-16.