349 



lag agrees very closely with the observed value. Since this value was 

 computed from that of the period of the temperature change, which 

 is accurately known to be twelve months, and from the foregoing 

 determination of the value of k 1 m l this agreement between theory and 

 observation affords strong evidence in favor of the reliability of the 

 value .2 adopted for k^m^ which is an important constant in the 

 investigation of ocean currents presented later. 



From numerous surface temperature observations in the Pacific at 

 long. 173 W, lat. 20 N (Puls, 1895, pis. 1-4), off Madeira in the 

 Atlantic, lat. 32 30' N (Kriimmel, 1907, p. 407) and off Yokohama 

 and at long. 140 W in the Pacific, lat. 35 N (Kriimmel, 1907, p. 408; 

 Thorade, 1909, pis. 1-3) it was found that the mean annual tempera- 

 tures agreed well with the normal values for the latitude. Therefore 

 there is good reason to suppose that the condition giving rise to the 

 temperatures at these places approximates closely to the normal con- 

 dition. Thus a comparison between the theoretical monthly tempera- 

 tures given by equations (39) and (40) with the observed values will 

 give a still more detailed test of the theory (table 2). 



TABLE 2 

 Theoretical and observed normal surface temperatures at a series of latitudes 



*Air temperatures at Honolulu (Monthly Weather Review, 1903, pp. 225-226). 



