Approves of proposal by A. T. Kupffer and Edward Sabine for international magnetic congress under JH's leadership. [Reply to JH's 1844-7-22 to HL.]

Reviews establishment of H.E.I.C. observatories and comments on quality of magnetic and meteorological observations at Simla, Madras, and Singapore. Has heard nothing from A. B. Orlebar, director of Bombay observatory.

Proposed date for B.A.A.S. meeting creates difficulty for HL. Assurance that no one other than JH could have provided such vital leadership for global magnetic survey. Doubts that [James] McCullagh could serve committee well; suggests [J. D.] Forbes instead.

Calls attention to vol. 3 of Toronto observations, where Edward Sabine, [T. R.] Robinson, and HL expressed their views on continuing magnetic observations. Emphasizes importance of discovering physical and mathematical laws that govern magnetic phenomena. Sufficient data already exist for this. Recommends continuing hourly observations for five more years at seven foreign observatories (listed). [JH note: Routing slip to B.A.A.S. committee, instructing each member to read and forward HL's recommendations.]

Forwarded JH's letter of 8 Aug. 1858 to members of magnetic committee, who will respond before B.A.A.S. meeting in Leeds next month. Asks that both committees meet jointly on first day. Edward Sabine is willing to superintend new series of observations proposed by JH.

Writes to ask for clarification of HL's views on the dispersion of light.

Activities at H.E.I.C. magnetic and meteorological observatories in Simla, Madras, and Singapore. Results from Simla, elevation 8000 feet, will complement high altitude observations in Europe. Vertical force instrument at Singapore is better than at all other stations, but high humidity there makes actinometer unreliable.