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BULLETIN OP THE BUREAU OP FISHERIES 
the western slope of the basin and in the sink off Cape Ann, highest (4° to 6°) in 
the eastern side and in the Eastern Channel — the isotherms for April (fig. 25) do not 
outline the warm indraft into the eastern side as clearly as do those for March 
(fig- 13). 
Fig. 25.— Temperature at a depth of 100 meters, April 6 to 20, 1920. The shaded area was colder in April than in March 
Unfortunately the data do not afford an annual comparison for depths as great 
as this, no readings having been taken so deep in April, 1925; but temperatures of 
2.7° to 2.9° at 80 to 84 meters in Massachusetts Bay on April 21 to 23 of that year, 
and of 2.9° at 91 meters at a station 8 miles off Little Duck Island (off Mount 
