SEA-FISHERIES LABORATORY 



169 



July 2, 1907. 54° 2' N. ; 3° 47' W. (Sea smooth and 

 weather fine all day.) 



Depth 



mo 



Cl°/oo 



S°/oo 



CTt 









11-6 



18-57 



33-55 



25-56 



\ 6.30 a.m. ; 2h. 

 [ 20 min. after 



92 



11-4 



18-56 



33-53 



25-56 



44-7 



11-4 



18-62 



33-64 



25-67 



1 High Water. 



(bottom) 

 



12-0 



18-60 



33-60 



25-53 



J 



\ 8.30 a.m. ; 4 h. 



I 20 min. after 



9-2 



11-5 



18-57 



33-55 



25-58 



40-3 



11-4 



18-63 



33-66 



25-68 



[ High Water. 



(bottom) 

 



12-1 



18-57 



33-55 



25-47 



| 10.30 a.m.; 



9-2 



11-45 



18-63 



33-66 



25-66 



I Low Water. 



40-3 



11-3 



18-64 



33-68 



25-71 



f 



(bottom) 

 



12-05 



18-46 



33-35 



25-34 



) 



; 12.30 p.m. ; 4 



9-2 



11-4 



18-62 



33-64 



25-66 



hrs. before 



40-3 



11-2 



18-65 



33-69 



25-74 



High Water. 



(bottom) 

 



12-4 



18-58 



33-57 



25-42 



\ 2.30 p.m. ; 2 



9-2 



11-55 



18-58 



33-57 



25-50 



[ hrs. before 



40-3 



11-2 



18-67 



33-73 



25-77 



[ High Water. 



(bottom) 

 



12-1 



18-59 



33-58 



25-50 



) 



\4.30 p.m. ; 



9-2 



11-6 



18-61 



33-62 



25-62 



1 High Water. 



40-3 



11-2 



18-66 



33-71 



25-76 



(bottom) 











J 



It is clear from the above that at any rate at some 

 stations a variation in salinity due to the tide alone does 

 occur. The variation, as was to be expected, is greatest 

 for the surface water and least for the ground water : — 

 The maximum variation at the surface in the above 

 experiment was 0*23 ; at 9'2 metres it was 0*13 and at the 

 bottom only 0*09. 



Now the maximum change of salinity for the same 

 station between February and November, 1907, was 0*81 

 for the surface and 0*88 for the bottom water. There can 

 be no doubt, therefore, that a small seasonal change in 



