OCEAN TEMPEEATUEES 



407 



TABLE 15 



Observed Salinities for August, 1912, February, 1913, and April, 1913, 



in Section 40 t 



From the formula for salinity (replacing & by 8 in equation 117) 

 it follows that the mean of any two salinities corresponding to a time 

 interval of six months would equal approximately the mean annual 

 salinity. Accordingly, the means of the salinities for February and 

 August are assumed to be the mean annual salinities in this case. The 

 constants C, D, and A of equation (117) were found as in the case 

 of temperature data by fitting the equation 



S m =Ce** + D (201) 



to the observed mean annual salinities, S m . Then the observed mean 

 annual salinity was subtracted from each of the entries under February 

 and April, and the expression 



was subtracted from each of these, using the same numerical values 

 for w t , r and a as on page 377, and the value of C determined above. 

 The remaining expression 



Me cos (at -f &!# e') 



