440 Mr. Lubbock on the Heat of Vapours 
as 2?' = /r ^' ( 1 + a 0') 
if 
—E) 
q l — y ’ 
p{p y -E) 
Ep 
I - Ep ^ 
7-1 
7-1 
p] 
I --Ep 
if 
log (1 — Hq) — — u 
c"^= 1 - Hq 
being the number of which the hyperbolic logarithm equals unity 
1 
^ = H^~'^ H^^~\ 
if -L- = 1 - 0, 
% 
= 1 - 0-^-1 + ny -^ 
Since C+Z)(l + a0) = ^ + JB — 
for atmospheric air. Eleniens de Physique, vol. i. p. 400, and by Navier, Leqons donnees 
d V Ecole ties Pouts et Chaussees, vol. ii. p. 310, in the form 
_ {\-\-etv) 
■3748 
