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An apparatus for the extraction of carbon dioxide from 100 liters of sea-water using carbonatefree sodium hydroxide solution as absorbant liquid and its performance is described. A test series of 6 sea water camples is presented, on which natural C14 determinations are made and the results obtained are briefly discussed in relation to other age measurements on similar waters. The correlation between salinity and C14 activity is shown. BROECKER, W . S., 1957: Application of Radiocarbon to Oceanography and Climatic Chronology. Dissertaticn Columbia University. CRAIG, H., 1957: Isotopic Standards for Carbon and Oxygen and Correction Factors for Mass Spectrometric Analysis of Carbon Dioxide. Ceochim. et Cosmochim. Arta 12, pp. 133-149. FERGUSSON, G. J., 1958: Reduction of Atmospheric Radiocarbon Concentration by Fossil Fuel Carbon Dioxide and the Mean Life of Carbon Dioxide in the Atmosphere. Proc. Roy. Soc. A 243, pp. 561-574, RAFTER, T. A., 1955: Cxq-Variations in Nature and the Effect on Radiocarbon Dating. N . 2. I. Sci. Tech. B 37, pp. 26-38. RAFTER, T. A., and FERGUSSON, G. J., 1957: Recent Increase in the C14 Content of the Atmosphere, Bio-sphere and Surface Waters of the Oceans. Ibid. B 38 SUESS, H., 1955: Radiocarbon Concentration of Modern Wood. Science 122. pp. 415-417.