VERTICAL AND HORIZONTAL MOVEMENTS IN THE OCEAN 609 



2^00 - 



)000 - 



}')00 - 





4000 - 



4^00 - 



OXYGEN 



Fig. 5. Station Cavall, March, 1958. To illustrate the important detail in 

 ox\'gen determinations which may be missed when deep stations are worked at 

 500-m depth intervals. 



Vessel Dana, certainly with uncoated bottles and without unpro- 

 tected thermometers for measuring depth; {c) the results of three 

 cruises by R.R.S. Discovery II, using coated bottles and unpro- 

 tected thermometers; {d) the results of two cruises by R.V. Sarsia 

 in 1956 with water-bottles some of which are now known to have 

 suffered from oxygen absorption by corrosion spots. 



Even if the 1922 results of Dana suffered from oxygen absorp- 

 tion, they still are the highest ever. From 1922 through 1930 to 



