The deep-sea circulation of the Atlantic has recently been carefully analyzed by Wiist (1935) who, on the basis of the tongue-like distribution of temperature and salinity, has drawn conclusions as to the direction of flow at different depths. He considers that an exchange of deep :water between the North Atlantic Ocean and the Antarctic Ocean is maintained by a flow to the north along the bottom of Antarctic water and a flow to the south at lesser depths of North Atlantic deep water and Mediterranean water.