1904] Mills — Molecular Attraction. 89 



theoretical, the molecular weight used being 260.8. For cal- 

 culating the latent heat, we have, 



A = antilog (1.3282379 f 0.000262120 



+ antilog (0.2481708 — 0.00368282/) 

 where t = t° C. 



Water. See Table 18. See Phil. Trans. 1892, p. 107. 

 Vapor pressures, 0° to 100° C, are Broch's calculations from 

 Regnault's measurements, and other values are from Ramsay 

 and Young. Density of the liquid, 0° to 100° C are from 

 values in Landolt and Bornstein's tables, p. 39, and 100° to 

 270° C are from Ramsay and Young. Density of vapor, 0° to 

 210° C are as given by Ramsay and Young from Regnault's 

 heats of vaporization, and 230° to 270° are "recalculated" 

 values from their own measurements. Latent heats, 0° to 

 230° C are from Regnault, and 240° to 270° C were calculated 

 by the author from the formula, 



A = antilog (0,1416514 — 0.0059507080 



4- antilog (0.13884017 — 0.001656138/) 

 where t=t° C + 20, the constants used for Biot's formula 

 being given by Regnault. 



Methyl Alcohol. See Table 19. Data from Phil. Trans. 

 1887A, p. 313; except density of liquid at 0° C from Dittmar 

 and Fawsitt, and at 10° C average value of 0° and 20°. Inad- 

 vertently the observed pressures were used for the calculation 

 of E T , but the difference thus made is never more than 0.1 to 

 0.2 calorie, and the error thus introduced into the constant of 

 equation 2 could never exceed one-tenth of one per cent. 



Ethyl Alcohol. See Table 20, Data from Phil. Trans. 

 1886A, p. 123; except vapor pressure at 241°, 242°, and 242.5° 

 C (calculated from Biot's formula); density of liquid 0° to 30° 

 and at 100° Mendelejeff, 40° to 80° from Kopp's formula, and 

 at 90° C estimated value. 



Propyl Alcohol. See Table 21. Data from Phil. Trans. 

 1889 A, p. 137. Observed vapor pressures were used to calcu- 



