72 SEA FISHERIES 



the centre, and 35 in the northern portion (in all cases on 

 the surface and at 20 fathoms). On the Newfoundland 

 banks the salinity varies from 32*8 grammes (in the Gulf 

 Stream) to 26*2 grammes (in Cabot's current). On the 

 Iceland banks we find 32*25 grammes on the surface, 35-2 

 at 400 fathoms, and 35 grammes at 500 fathoms. On the 

 Atlanto-Saharan bank, in the open sea, the proportion is 

 37-04 ; in Greyhound Bay it is 38 at high-water and 41 

 at low water. 



The temperature is subject to much greater variations. 

 In the Channel we obtain the following data 1 : 



February, May. August. November. 



Surface 4i*o3-5o*o9 46'72 -5i'87 59 -62'9 

 Bottom 4i-o5-5o-4i 46'7i-5o-66 c 



1 Here is a series of temperatures from the Channel, taken from 



east to west : 



February. 



Surface, 4i'O3 44-6 46-08 47*05 48-2 (the Hague dike), 

 49*87 50-27 (edge of plateau). 



Bottom, 41*3 44'6 46-13 49-89 48*31 (the Hague dike), 

 48-2 50-91 (edge of plateau). 



May. 



Surface, 44-72 46*9 48-29 48-29 49*24 (the Hague dike), 

 50 51-02 51-87 (edge of plateau). 



Bottom, 44-71 46-9 48-3 45-57 48-29 (the Hague dike), 

 50-09 49-49 50-66 (edge of plateau). 



August. 



Surface, 59*11 6o'92 60-91 60*47 59*29 59 (the Hague 

 dike), 59 60-85 62-27 62*9 (edge of plateau). 



Bottom, 59-04 60-89 60-85 59-86 59-11 (the Hague dike), 

 57-86 55-76 50-84 51-74 (edge of plateau). 



November. 



Surface, 53-65 53-69-547i55'i6 55*68 56*35 (the Hague 

 dike), 55*49 55-63 55-07 55-09 (edge of plateau). 



Bottom, 55'23 54*62 54'95 55'3455 t 8i 56'5i (the Hague 

 dike), 56-53 55-76 51-76 53-76 (edge of plateau). 



