Page:An account of a voyage to establish a colony at Port Philip in Bass's Strait.djvu/242

( 217 ) also be strengthened by the fusion of the southern polar ices, during the southern summer solstice; and this will operate, though in a diminishing ratio, until the sun reaches the equator on his return to the southern hemisphere. See St. Pierre's Theory of Currents in "Les Etudes de la Nature."