The observations tabulated in the present paper were taken at Ben Nevis Observatory, chiefly during August 1885. In a note communicated to the Society at the end of last session, a description was given of some observations of air-temperatures and humidities at Granton Marine Station, and it was stated that the work was to be continued at Ben Nevis. At present we confine ourselves to the hygrometrical work : it is hoped that the results of the temperature observations will be communicated to the Society early next session.