518 



TABLE HI. Virial-coefficients of neon. 



'A 



20' C. 

 0' 



+ 1.0731 

 4- 0.99986 



B^ X 103 



c.xn 



+ 0.51578 

 + 0.41334 



+ 0.82778 

 + 1.1538 



The differences between tlie observed vakies of pr , and those 

 calculated willi the above coefllcients are found in Table I in the 

 last two columns. As the table shows, the isothermal of 20° C. 

 seems to be slight!}' more acciii'ate than that of 0° C. a circumstance 

 which may be connected with (he fact of its being more difficult 

 to keep a vessel at a constant temperature of 0° C. than at one of 

 20° C, when an efficient thermostat is being used. 



The communication of the value of the virial-coefficients for low 

 temperatures, as also the calcnlalion of the BoYLE-point {Bi = 0) 

 we defer to a subsequent paper. 



3. Boiliiu/ point, va2)0ii,r-pr('ssiire,t, liquid c/ensitii's, triplcpoint. 



The vapour-pressures were directly determined as the pressures 

 of a bath of liquid neon, in which a helium-thermometer was 

 placed, the same as served for the measurements by Kamerlingh 

 Onnes and Webek. ') 



The value found for the pressure at the triple-point differs but 



1) H. Kamerlingh Onnes and S. Weber, These Proceedings supra. Comm. 

 NO Ulb. 



^) Calculaled by inlerpolation. 



