Will send two photometers and three-year supply of paper to [?]. One goes to J. C. Ross and one to F. Eardley Wilmot at Cape of Good Hope. Instructions for using photometers. Hopes [?] Robinson forwarded actinometers to Woolwich as JH directed. These should be checked at St. Helena. Instruction for using actinometers. Sent report to Humphrey Lloyd at B.A.A.S. Returns [?]'s Daguerre newspaper containing 'impudent notice about M. Pambour and his great Wheels.'

JH's experiments to find compounds suitable for photography. Accidental discovery of effect of 'nitrate of Silver.' Note of 22 Jan. from Francis Beaufort alerted JH to L. J. M. Daguerre's secret processes and W. H. F. Talbot's experiments.

Fourth observatory, at Van Diemen's Land [Tasmania], will be conducted by J. H. Kay, to be landed from one of vessels [Terror and Erebus] bound for Antarctica. This vessel will also carry observers and instruments for stations at St. Helena and Cape.