. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 94 bulletin: museum of comparative zoology. Bay (Station 10402, Fig. 8) this had been so rapid that even as early as November 2 the temperature was practically uniform vertically down to 50 meters, indeed fractionally cooler at the surface than immediately below: near the Isle of Shoals and in the western basin however, (Stations 10400, 10401, Fig. 10) a temperature gradient of about 2° still persisted. The November records for the western basin are further valuable, there being no previous data for the off-shore part
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. 94 bulletin: museum of comparative zoology. Bay (Station 10402, Fig. 8) this had been so rapid that even as early as November 2 the temperature was practically uniform vertically down to 50 meters, indeed fractionally cooler at the surface than immediately below: near the Isle of Shoals and in the western basin however, (Stations 10400, 10401, Fig. 10) a temperature gradient of about 2° still persisted. The November records for the western basin are further valuable, there being no previous data for the off-shore parts of the Gulf between September 1 and May, as showing that the surface cooling which takes place during the autumn (Fig. 10), is ac- companied there, just as near land, by a rise of temperature in the mid-depths consequent on the increasing freedom of vertical circula-. FiG. 7.— Salinity profile crossing Massachusetts Bay just west of Stellwagen Ledge, July 19, 191b. The contour of the Ledge is shown by the heavy broken curve. tion allowed by decreasing vertical stability. Unfortunately none of the November stations went deep enough to reach the bottom layers of the Gulf, so important in their influence on its general hydrography. Salim'fy. The general distribution of salinity in Massachusetts Bay, July, 1916, closely paralleled that of temperature (Fig. 4, 7), its water being freshest when warmest, saltest when coldest, with the curve for 32%o agreeing almost exactly with 5°; with 9°. And the salinity, like the temperature of the western side of the Gulf was then decidedly lower than in any recent summer of record; •5%o-l%o lower for example at all depths oft' Gloucester than in July 1912, with even greater difference between 1916 and 1913, although. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original wo
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