PHYSICAL OCEANOGEAPHY OF THE GULF OF MAINE 



851 



May or the first half of June, for salinities as high as 34.5 to 35 per mille were con- 

 fined to the channel and to the neighboring part of the basin during the last half of 

 that month, with bottom values of 33.8 to 33.9 per mille in the inner branches of the 

 latter — western as well as eastern. A considerable indraft of slope water certainly 



43^ + 



Pori'ard 



Fio. 172.— Depth of the density surface (isopycnobath) for 1.027; March, 1920. Corrected for compression 



took place shortly thereafter, however, spreading inward over both arms of the basin, 

 where the salinity of the bottom water had again risen above 34 per mille by the 

 end of the summer in a layer of considerable thickness (p. 786). 



