420 SHORT MEMOIRS ON METEOROLOGICAL SUBJECTS, 



there follows, from e«]uatiou 2, 



P 

 Further, the quantity of vapor q preseut iu one kilogram of saturated 

 air, or 



0.G23- 

 .,_ P 



1-0.377- 



P 

 gives the equation 





(4) 



(Iq __ de dp 



P 



de dp 

 _ e p 



1_ 0.377- 



- de J dh 

 J'd'r^^ ET 



1 - 0.377 - 



P 

 By means of equations (3) and (4), equation (1) now becomes 



-rq /I de.^ , <^ft\_.,.n , ^"^ 



/I de -.^ , dli \ , -.. ^ dh 



whence — 



(I) 



1-0.377- 

 P 



1 - 0.377 - 



P>I<L 



dt ■ ) J '^ RT 



(.(x_o.3np,.,l.- 



This formula differs from yours iu the introduction of -jj-j, instead 



of - and also by the occurrence of the factorf 1 — 0.377 - ) in both the j 

 P ' \ py \ 



numerator and denominator. If, according to this formula, we com- 

 pute ^^^r^ for the case Q ^ ^^^^^J, we find lyj- = — 0.00534, whereas 



your table gives — 0.0054. 



In case the i^roblem concerns the ascent, not of a narrow current, but 

 of a great mass of air, it is questionable whether it is not more correct 



