J. W. Gibbs — Vapor-Densities. 379 
preparation are given in the following table with their loga- 
rithms, and the differences of the logarithms for one degree of 
temperature. 
Temperature. Pressure. log. pressure. diff. per 1°. 
O71 6°42 “8075 
: 12°12 7:33 .8651 pe 
: 14°33 8°42 "9253 ney 
14°87 8:59 "9340 0259 
q 22°37 5 1/1189 0232 
i 25°28 15°36 1°1864 
used for the comparison of Horstmann’s experiments with the 
formula (12) which is given in table VIL Unfortunately this 
culated by equation 12) from these pressures and the tempera- 
tures of the first column, and the densities obtained by com- 
noe Horstmann’s Spe mens with Regnault’s pressures. 
i 
