48 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
rise in the surface temperature readings (55°-57°) although the air 
rose from 58°-63°, and the temperature readings taken on various 
days show that diurnal warming is very much less in this region than 
it is in the warmer off-shore waters. So far as our observations go, 
they suggest that in the cold coast water northeast of Mt. Desert 
diurnal warming is not usually observable; thus the diagram for 
August 6th (fig. 7) shows a slight fall (56°-57°) from 6 a. mM. until 
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MEMERSSREY 
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BESVeSe AAS AMAR 
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Fie. 8.— Temperature sections at Stations 2, 23, 24, 25, 29. 
SRR S2R27 SSA 
tithe n hE Rime eas Skt tok Ke 
‘noon; although between 9 a. M. and 4 p. m. the air temperature rose 
from 56° to 68°. 
To explain the distribution of the surface temperatures of the Gulf 
of Maine, just outlined, requires a knowledge of the temperatures in 
the underlying water layers at the same season, which is afforded 
for the first time by the Cruise of 1912. 
Temperature sections.— The section made off the mouth of Massa- 
