A STUDY OF COHKELATIONS AMONG TERRESTRIAL TEMPERATURES. 



335 



In the actual investigation I have taken the epoch 1844.6 as that from which t is 

 counted. This epoch corresponds to a sun-spot minimum ; but this is unimportant at 

 the present moment. From this starting point the value of the angle of fjit was taken 

 for the middle of each year, and its sine and cosine, with their squares and products, 

 were computed with i-esults shown in the following table : 



Table I. 

 Coefficients for Detecting Fluctaations Having the Sanspot Period. 



With this table the computation of x and y is so easy a matter that I have for the 



