I had the opportunity to be part of a hydrology and sounding cruise in the Bay of Biscay on board the "Thalassa" in May and June 1964. During this expedition, which aimed to study deep water turbidity, I took some measurements from the sampled waters. I would like to thank M. OARDIGNAC, head of mission for the I.S.T.P.M., for his help in the implementation of the measurements and for passing on the results of the salinity and temperature measurements conducted under his direction. As my work was conducted outside of the I.ST.P.M.'s hydrology program, I could not actually analyse all the samples collected in the framework of the study of the waters of the Bay of Biscay. On the other hand, my main goal was to measure deep waters turbidity, around submarine canyons or next to the continental slope. This is the reason why my observations were exclusively limited to deep hydrological stations executed on the submarine continental slope. A general table, provided at the end of this work, gives, along with the positions of the stations, the results of the measurements. I will quickly review the results that can be inferred from this partial investigation.
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