J. W. Gibbs — Vapor- Densities. 283 
used to mark the quantities relating to the neutral gas. But 
these quantities would disappear with the elimination of di, 
and equation (8) and all the subsequent equations would require 
no modification, if only p and D are estimated (in accordance 
with usage) with exclusion of the pressure and weight due to 
the neutral gas. This result, which may be extended to any 
oe of neutral gases, is simply an expression of Dalton’s 
aw. 
now proceed to the comparison of the oe especially 
of equation (6), with the results of experimen 
TABLE rules ovis oF NITROGEN. 
Experiments at Atmospheric Pressure. 
MITSCHERLICH,—R. MULLER,—DEVILLE and TRoosT. 
Denaity observed. Excess of observed de 
Temper- | Press- Density Deville & Troost. Deville & Troost. 
ature. ure. oa. ¢ 10. pa epee DeraarncneserNise Stan GPa 
Mey OY TR Ts 1 eee UU. 
183°2 | (760) | 1-592 1°57 —*022 
154-0 | (760) ‘597 1°58 —017 
518 | (760) | 1°598 1:50 eel cud 
35°0 | (760) “607 1°60 —"007 
21°8 | (760) "622 1°64 +702 
21°5 | (760) 622 162 —'002 
11°3 | (760) | 1-641 1°65 +7009 
00-2 “61T 1°72 +04 
100-1 | (760) 616 1°68 +°004 
100-0 | (760) L677 1-71 +°03 
90°0 | (760) | 1-728 1-72 —-008 
84-4 | (760) | 1-768 1:83 +06 
80°6 | (760) | 1-801 1:80 —001 
79 8 [814 | 1:84 +°03 
77-4 | (760) 1-833 1°85 +02 
70-0 | (760) -920 1-92 000 
545) 1919 | 1°95 +°03 
68-8 | (760) 937 1-99 +05 
66-0 | (760) ‘976 2-03 +°05 
60°2 | (760) | 2-067 2-08 +°013 
55°0 | (760) | 2-157 2°20 +04 
157 2-211 | 2:26 +05 
49-7 | (760) | 2-255 2°34 +09 
49°6 | (760) | 2-256 2-27 +014 
45-1 | (760) 342 +06 
39°8 | (760) “443 2°46 +017 
35-4 | (760) 524 2°53 +006 
35-2 | (760) | 2°528 2-66 +13 
34°6 | (760) 539 2°62 +08 
32 748 ‘582 | 2°65 +°07 
28-7 | (760)| 2 2°80 +16 
751 2°6 2°70 +°05 
27°6 | (760) 2-661 2°70 +04 
26-7 | (760) | 2-676 2°65 —026 
