4<n; 





Miscdli 



'iirovH 1 ntelligence. 





The differei 

 thermic mc 



""ease beta" w 



3 two mean den 

 named to be un 



3? 



11 be found by 



The rate of 

 Dm the ground 



upw: 



ml, il 



may be suppos 



ed that at some 



height 



(can it f, its 



becomes unit v when expri 

 The thermic increase of jie 





ty at th 



)f the ! 



e ground, and 

 nitial density. 

 grtical space is 



then 



expressed by 1 -. or y., and the es 



picsior. 



, for the differ- 



ence 



betwet 



m the mean thei 



■mic densities becomes 









B-A 



2 B-A 

 X D~ D ' 







This 



iVael 

 then 



ts th 



s the fraction by which the then 

 relative densities of B and A 

 which the deduced altitude 

 iation of density. The correct! 



; it also expresses the 

 A is affected by the 

 on is therefore 









A {B-A) 







The 



original assumption 



of uniformity 



of temperature and 



st be determined < 

 , of thermic den si 



of 1> whirl, will gi\c tie- best average re>ult. Tins method was 

 applied to the ease of observations 'taken by t be ( 'alifornia Geo- 



