The present paper is a preliminary report on an investigation of the exchange of heat and water vapor between the sea and atmosphere with particular reference to the regional and seasonal variations in these quantities over the North Atlantic and North Pacific oceans. The mean annual evaporation over the oceans according to latitude ranges can be considered fairly well established (Wüst, 1936; Mosby, 1936; McEwen, 1938), but there has been no extensive investigation of the seasonal and intra-latitudinal variations....