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The quantity of rain which falls during the course of the year, is a very uncertain test of the moisture or dryness of any particular season, situation, or climate. There may be little or even no rain, and yet the air be constantly damp and foggy; or there may be heavy rains, with a comparatively dry state of the atmosphere. The same depth of rain will likewise produce different effects on the air, according as it falls upon a flat or hilly country; for large quantities soon quit the hills or high grounds, while smaller quantities have more lasting and powerful effects on a flat country. Much also depends upon the nature of the soil, whether clay or sand, whether firm and compact, or loose and spungy. Is not evaporation therefore a more accurate test of the moisture or dryness of the atmosphere, than the quantity of rain?

philosophical transactions of the royal society of london

XIII. Observations on the annual evaporation at Liverpool in Lancashire; and on evaporation considered as a test of the moisture or dryness of the atmosphere