40 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. M. until 



41* 42 43 44 45° 46 47 48 49 SO" 51 52 53 54 55° 56 57 58 59 60" 61 62 63 64 65° 



Rth. 

 



5 



10 



15 



20 



25 



50 



55 



40 



45 



50 



55 



60 



65 



70 



75 



80 



85^ 



90 



95 



100 



105 



Fig. 8. — Temperature sections at Stations 2, 23, 24, 25, 29. 



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- 























/ 

























































































































































/ 



















































25 



/ 







































2, 













/ 







































/ 







'za 



24 







/ 





r 

















































/ 







































/ 





























































































































































\ 

















































































































































































































































































































































































































































































































































































































































