J. W. Gibbs — Vapor- Densities. 381 
Since each successive purification of the substance employed 
by Regnault diminished the pressure of its vapor, it is not 
picion of being too high, and it is quite possible that more 
Taspie VIII.—PrrRcHitoRIDE OF PHOSPHORUS. 
Experiments of MrtscHERLICH, CAHOURS, WuRTZ, and Troost and HAUTEFEUILLE. 
Feo mage Press- aa Density observed. | Excess of observed density. 
pe a ae Mitseb. Cahours. | Mitsch. Cahours. 
336 | (760) | 3°610 3°656 +046 
327 154 3°614 3°656 +042 
300 165 3°637 3°654 +°017 
289 | (760) | 3°656 3°69 +034 
288 763 3°659 3°6T +011 
274 155 3°T01 3°84 +°139 
250 751 3-862 3°991 +129 
230 146 4°159 4°302 +142 
222 5 "B44 4°85 +506 
208 | (760) | 4°752 4-73 —021 
200 158 5-018 4°851 167 
190 15 5-368 4987 —-381 
182 45 5°646 5078 5 
# T.& HH. Wurtz. 
1785 | 29721 5-053 | 5-150 +097 
1758 | 253-7] 5-223 5°235 +012 
76 | 221-8] 5°456 5-415 _ 
54-7 | 997 5-926 5°619 —30T 
501 | 225 6086 5°886 —'200 
244 6°169 —"205 
391 6°45 6°55 +°10 
45 311 7 6°70 +°33 
45 07 6°36 633. —'03 
144% | 247 | 6-287 614 “TAT 
137 281 6°53 6°48 —"05 
137 269 6°51 6°54 +03 
137 243 6.46 —02 
137 234 64T 6°42 —05 
: 137 148 6°31 647 +16 
129 191 6°59 618 —41 
129 170 6°56 6°63 +07 
165 6°55 6°31 — 34 
* Pogg. Ann., vol. xxix (1833), p. 221. 
pi Ormpten Rendus, vol. oe (1845), p. 625; and Annales de Chimie et de Phy- 
48, Ser. 3, vol. xx (1847), p. 369. ee: 
+ Comptes Beaton. v0k fies (1873), p. 601. § Ibid., vol. Ixxxiii (1876), p. 977. 
