( 146 ) 
advantage consider the deviation which » would have to undergo in 
order to yield this variation in pv. 
At 0° C. for instance instead of the percent deviation in pv, at 
Pa 8h: BF, 160 Woe een ee OB. 160 @ 17h ZOO EN 
—14.5*, —18.5*, —21.6%, —31.4") ANS 11.0%, —9.7*, —7.7% bt 
we have to put 
=06 ,.-098, 1.0, DOE —07 =S OGERESUE 
percent variation in v 
Also vat. 30> Crand PS < 4o PoE 100 atm. 
instead of +16,5*, + 6.5*, —12.7*, —5.2* percent of pry 
+ 1.5 ,+ 0.6 ,— 1.1 ,—0.5 percent of vy 
anda 20e ande == (57 300 atm. 
instead of +19.1*, + 5.9* percent of pr, 
+ 2.6, + 1.2 percent of vy 
The criterium of MAXWELL expressed in Lae of the unit of pv 
10000 A 
agrees to 
+ 157 at 0° 
4.13) & 40? 
ET Pigs ete 
4+ 36 » 80° 
Both the deviation just considered and this latter, would be con- 
siderably smaller if we had only employed carbon dioxide. 
a end 
