VERTICAL AND HORIZONTAL MOVEMENTS IN THE OCEAN 



607 



2500 



}000 - 



0) 

 2 



3500 





4000 - 



A-iOO — 



^o 



>? / 



OXYGEN Ml/L 



Fig. 3. The distribution of oxygen against depth at station Cavall on four 

 occasions in 1958. 



to work the station with a mixed hoist of bottles, some protected 

 with Araldite, others not so protected. Four of the unprotected 

 bottles were used within the range of depths covered by Fig. 4. 

 Three of them came outside the envelope of our 1958 results ob- 

 tained with Araldite-coated bottles, and have not been included 

 within this discussion. 



Many oceanographers are interested in long-term changes in the 

 oxygen content of deep water. Standard practice in the past has 



