516 



Owing to the uncertainty of the depths at the third station, due to 

 the bad weather and consequent stray on the wire, it was decided not 

 to include these observations in a consideration of the hydrographic 

 conditions, and to make what deductions were possible from the results 

 obtained at the two stations given. 



It is interesting to note that at the Chcdlenycr Station, No. 27, 

 in 22° 49' K, 65° 19' W., March 28th, 1873, where the depth was 

 2960 fathoms, the actual temperature reading at 200 fathoms was 

 17*22° C, and that this agrees more closely with the temperatures in 

 the Tongue of the Ocean than that taken from the Challenger 

 smoothed curve, which was 18-17° C, 



From this diagram it can be seen that the surface salinity increases 

 from west to east very rapidly, 0-34%o in 7^ miles, but the surface 

 temperature is fairly uniform, between 26° C. and 27° C. 



At both stations the salinity increases downwards to a maximum 

 probably lying between 10 fathoms and 50 fathoms, but more rapidly 

 at Station I, so that from 10 fathoms to 50 fathoms the salinity 

 decreases from west to east. 



Below 100 fathoms the conditions are closely similar at both stations, 

 as far as the observations go ; the salinity decreases fairly rapidly to 

 400 fathoms and then more slowly to the bottom. 



The temperatures decrease rapidly and uniformly from the surface 

 to about 500 fathoms, then more slowly to the bottom. 



There is practically no thermocline (German s^nungscMcht) at any 

 depth, and the salinity shows only a poorly marked discontinuity 

 layer, confined to the upper stratum. This absence of a thermocline is 

 remarkable. 



In general, below about 250 fathoms the temperatures and salinities 

 agree with the nearest stations of the Michael Sars in the open Atlantic : 



