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Informs HL of the intention of holding a magnetic congress at the meeting of the B.A.A.S. in 1845, and JH seeks HL's opinion.
Regarding the revision of the instructions for the magnetic observatories.
G. B. Airy needs HL to send him the information used to set up colonial magnetic observatories.
About the urgent need to prepare a report on the magnetic observations, and that HL is the most logical person to give direction to it.
Urges some revision in both the report and instructions for the magnetic observations.
Asks HL for comments about the question of continuing the magnetic observations.
Question of procedure about considering the magnetic observations for publication.
Is trying to organize a meeting of the Magnetic Committee before the meeting of the B.A.A.S. in Cambridge, to deal with reporting and committee membership.
Further to arrangements about meeting [see JH's 1845-5-30].
Asks questions about how to proceed for the continuance of magnetic observations.
Sends to HL a sheet of curves laid down by [Charles] Riddell, comparing Brussels declination observations with those made in Toronto. JH frequently refers to HL's work on the subject of terrestrial magnetism.