with Height in the Atmosphere. 20T 



This decrement is rather rapid, and is, no doubt, partly to bo 

 accounted for by the comparatively sheltered situation of the 

 lower station. 



The influence of the season of the year on the decrement of 

 temperature is particularly striking, as the following Table 

 shews ; and that the discrepancies it contains are not generally 

 errors of observation, is pretty clear, from the agreement of 

 the morning and evening columns, and various other tests, 

 which it is not necessary to mention. 



Table I. 

 Calculation of the Mean Temperature of each Month durincf the Years 1831- 

 S2-33-34-35, at Bonally and CoUnton, and corrected for the errors of Qra- 

 duatimi of Thermometers. 



