In an attempt to establish correlations between variations in the abundance of certain marine organisms and fluctuations in hydrographic variables, a program was initiated late in 1950 that involved periodic sampling of water and plankton from the surface to depths of 1000 meters. The physico-chemical variables of temperature, salinity, oxygen, silicate and phosphate were determined at intervals from the surface to a depth of 1000 meters for the first 2 years of the program, and to 900 meters subsequently when the loss of some of the hydrographic wire necessitated limiting the depth of the casts. This report presents the hydrographic data. (Author).