. [A biological survey of the waters of Woods Hole and vicinity. Marine animals; Marine plants. 450 BULLETIN OF THE BUREAU OF FISHERIES. are presented in a series of tables, and likewise on charts 211 to 214, giving the location of the stations. The average monthly temperature of the water off the Government wharf in Great Harbor, Woods Hole, for the years 1902-1906 (five years) is given in table 10, page 47, and the seasonal changes are portrayed graphically in chart 219. It will be seen that during January, February, and March the mean temperature was below 35° F. The period when the tempera
. [A biological survey of the waters of Woods Hole and vicinity. Marine animals; Marine plants. 450 BULLETIN OF THE BUREAU OF FISHERIES. are presented in a series of tables, and likewise on charts 211 to 214, giving the location of the stations. The average monthly temperature of the water off the Government wharf in Great Harbor, Woods Hole, for the years 1902-1906 (five years) is given in table 10, page 47, and the seasonal changes are portrayed graphically in chart 219. It will be seen that during January, February, and March the mean temperature was below 35° F. The period when the temperature was below 35° actually extended from about December 25 to March 15, and this may be considered the \vinter season. After March 15 the temperature rose rapidly, passing 60° about June i; this constitutes a spring season. Between June i and October 12 the temperature remained above 60°, holding between 69° and 71° from July 11 to August 28, a period of 48 days; this is the long summer season of warm water. After October 12 the temperature fell rapidly from 60°, until December 11, when it reached 37°, and it remained between 37° and 35° until December 26, when it passed below 35°; this period may be considered the autumn season. A table of averages such as that of table 10 does not give the extremes of temperature, the lowest of which was 28^° in January and February, and the highest 74° in July and ° in August. It should also be remembered that the extremes are much greater in situations more sheltered than Great Harbor, Woods Hole, as, for example, in the upper portions of Buzzards Bay, where the water may be heavily frozen for several weeks and the summer temperature probably rises close to 80°. It is very important to contrast the seasonal range of temperature at Woods Hole with that of the bottom water between Gay Head and the ledges of Sow and Pigs, for in this region of the surv^ey the range of temperature is the least. On August 16, 1907, the bottom
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