MR MOSSMAN ON TEMPERATURE VARIABILITY. 529 



At Lady Franklin Bay there is virtually no diurnal range of variability on the mean 

 of the year. From February to May there is a morning maximum and afternoon 

 minimum, but this effect is reversed during the other months of the year. 



At Hong Kong the diurnal range of Temperature variability is of a comparatively 

 simple and regular character, the values being above the mean of the day from 9h. 

 to 17h. and below the mean during the rest of the day. The maximum occurs at 14b. 

 and the minimum at midnight. 



In the foregoing remarks no serious attempt has been made to grapple with diffi- 

 culties which surround the satisfactory explanation of why the variability should be 

 different at different hours of the day. It is obvious that solar radiation, through the 

 varying altitudes of the sun, is one of the most potent factors ; but more material is 

 required than that here discussed. 



[Tables 



ROY. SOC. TKANS. EDIN. — V0I . XLII. 3 y 



