Hydrographic data at Ocean Station Echo (35N, 48W) form an almost continuous 6-year series ending in 1973. The temperature fluctu ations at periods longer than about 8 months appear to be largely from the first vertical mode, and at periods of about 7 to 4 months from the second. These fluctuations are found to be coherent with those seen in the Panulirus data, at Bermuda, if the travel time for group velocity is included....