A History of Science, vol 3

833- -Confirmation of Chladni's hypothesis of 1794--The aurora borealis--Franklin's suggestion that it is of electrical origin--Its close association with terrestrial magnetism--Evaporation, cloud-formation, and dew--Dalton's demonstration that water exists in the air as an independent gas--Hutton's theory of rain--Luke Howard's paper on clouds--Observations on dew, by Professor Wilson and Mr. Six--Dr. Wells's essay on dew--His observations on several appearances connected with dew--Isotherms and ocean currents--Humboldt and the-science of comparative climatology--His studies of ocean currents-- Maury's theory that gravity is the cause of ocean currents-- Dr. Croll on Climate and Time--Cyclones and anti-cyclones, --Dove's studies in climatology--Professor Ferrel's mathematical law of the deflection of winds--Tyndall's estimate of the amount of heat given off by the liberation of a pound of vapor--Meteorological observations and weather predictions.

CHAPTER VI

. MODERN THEORIES OF HEAT AND LIGHT