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Detailed explanation of how to take readings from and issues around readings from a psychrometer, references to contemporary research in hygrometry and the work of [Andrew John] Herbertson and his work at Ben Nevis, commentary on work of [ ] Groyet, [ ] Regnault, and [James] Glaisher with various types of psychrometer for the measurement of relative humidity. Describes Hazen's own experiments and outlines formulas relating to vapour and air pressure.

Discusses work at the Ben Nevis 0bservatory. Lengthy discussion of theories and practice of [Henry Allen] Hazen and requesting that Herbertson respond to Hazen. Brief mention of Professor and Mrs Ward, Professor Jack of Glasgow. 'Antarctic Bruce' to visit the observatory in the spring. Mentions drought at Fort William and discusses Aitken's dust counter. Describes preparing for winter at the Observatory.