876 J. W. Gibbs — Vapor- Densities. 
n Table VI are exhibited the results of experiments by 
Playfair and Wanklyn,* in which the vapor of the acid was 
diluted with hydrogen or, in a single case (the experiment at 
5°5°), by air. Columns I and II of the observed densities 
relate each to a series of observations by the method of Gay- 
Lussae, column III contains four independent determinations 
by the method of Dumas. The numbers in the column of 
TasLre VI.—Acertic Acip. 
Experiments of PLAYPaIR and WANKLYN. 
Temper. Prese- og Density observed. Excess of observed density. 
eq. (12). : hn LE, 
212°5 | 322°8| 2-194 2-060 — "064 
194 326°0| 2-168 2-055 mn LES 
186 | 254-4|} 2-173 | 1-936 —-237 
182 319-4 | 2-213 2-108 —"105 
166°5 | 289°5 | 2-293 2°350 +°057 
163 45°38 | 2-290 | 2-017 —-273 
132 127°5 | 2-628 | 9-299 —*336 
130°5 | 285-7 | 2-799 2-426 — 303 
119 690 | 2914 2-623 —‘291 
1165 | 211-3} 2-876 | 2-371 —-505 
95°5 |(123-8)| 3-105 2°594 — bil 
86°5 |(200-4)| 3-432 3°172 a 
79°9 | (83-3)| 3-297 3°340 ah 
62°5 | (46-2)! 3-473 3-950 +47 
peer of positive values for the excess of observed density, 
_ but rather the opposite 
_ On the whole, these experiments furnish no decisive indica 
tion of any influence of the hydrogen or air upon the vapo! 
*Trans. Roy. Soc. Edinb., vol. xxii, p. 455. 
Poses 
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