374 



DEPARTMENT OF THE NATAL 8ERTICE 



rV. ADDENDUM. 



SUPPLEMENTASY CKUISE IN C.G.S. "ACADIA" CONDUCTED BY COM- 

 MANDER F. ANDERSON IN THE AUTUMN OF 1915. 



As stated on p. 356, a supplementary cruise in the autumn of 1915 had been 

 planned in order to follow up some of the most important features in the hydro- 

 graphical conditions of the waters investigated- This cruise took place in C.G.S. 

 Acadia from November 14 to November 22, and the hydrographical material collected 

 has been sent to Norway for further elaboration in connection with that from the 

 spring and summer cruises. As, however, tlie latter material had been worked up, 

 the sketches drawn, and the manuscript almost ready for printing, it was found most 

 convenient to finish this part according to the original plans, and to work up the 

 results of the autumn cruise as an addendum. 



The cruise was laid from Halifax, N.S., out to station V 4 of the spring cruise, 

 and from there along the coast of Nova Scotia and C. Breton island north to the New- 

 foundland coast and back again to C. Breton island, twice crossing Cabot strait. The 

 most interesting part of the cruise is the two cross-sections of the Laurentian channel, 

 the one almost identical with section IX of the spring cruise, the other more westerly. 



i'ig. 8. — Map showing the course of the Autumn cruise. 



Fig. 8 shows the course of the cruise and the most interesting features of the bottom 

 configuration. 



AUTUMN CRUISE (Table le). 



Station 92. 



The position of this station is the same as station Y 3 of the spring cruise. As it 

 cannot very well be included in any of the sections it is taken apart. 



Salinity. — The salinity of the surface water is not as high as in the spring, 30-40 

 against 30-92 Voo. The 30-water reaches down to 40m., against lOm. in the spring. 

 Down to 60m. the water is Salter in the spring than in the autumn, but from there 

 down to the bottom the salinity is almost identical in both seasons. 



Temperature. — From the surface down to about 40m. we find that the tenmerature 

 is very uniform, between 8-2° and 8-4° C. From this depth the temperature decreases 

 evenly to 1-9° C. at 110m. During the spring we found a uniform temperature (a 



