VERTICAL AND HORIZONTAL MOVEMENTS IN THE OCEAN 



611 



evaluate the age of the abyssal water in the eastern North x-^t- 

 lantic. A different approach is preferred — the evaluation of the 

 fine structure of the deep water. At station Cavall in 1958, 340 

 separate analyses of oxygen were made. The data in March, April, 

 and September are presented in Fig. 7, replicates being averaged. 

 On the April cruise many very concordant analyses of oxygen 

 were made but were not matched by salinities of equal value. 

 Consequently April values appear on Fig. 7 but not on Fig. 2. 

 The ranges of temperature have been adjusted from those first 

 selected by inspection of the oxygen /potential temperature dia- 

 grams, but in doing so the standard deviations of observations 



Fig. 7. Station Ca\all, March, April, and September, 1958, combined. Cur\-e 

 fitting by method of least squares of oxygen/potential temperature observations. 



