— 52 Wind and Evaporation.—It has not been possible with the instruments at hand to determine mathematically the relation existing between evaporation and other meteorological factors, but by means of a home-made anemometer in which the wind pressure was transmitted to a pen making a vertical stroke on a revolving drum, the intensity and the distribution was obtained daily over a period of two months. Daily records of temperature and evaporation were taken by instruments placed near anemometer.

Considerations of space forbid that the entire series of readings should be given, but representative readings have been chosen, showing that although temperature does exert an influence, the part played by the wind is relatively important.

Date.