3o6 



DEPTHS OF THE OCEAN 



it was a little colder in 1876 than in 19 10, at other depths a 

 little warmer, but no general difference appears between the two 

 series of temperatures — one series taken thirty-four years after 

 the other. There have probably been many variations in the 

 course of these years of which we have no knowledge. In this 



TEMPERATURE C 

 10' 12° 14" 



'CHALLENGER 6.5. 1876 32° 41 N. 36 6' W 

 ("MICHAEL SAR5' 6 6. 1910 3l' 20N 35°7'W 



Fig. 211 — Comparison of the Temperatures taken by the "Challenger" 



IN 1876 AND BY the " MICHAEL SaRS " IN I9IO. 



and in many other respects the Atlantic Ocean calls for further 

 and more detailed investigation ; as we said at the beginning of 

 this chapter, very much more work will have to be done before 

 we shall be able to solve the many interesting and important 

 problems relating to the great ocean waters. 



B. H.-H. 



