lo Harold N. Allen. 



Thus on one side the nickel, platinum, and carbon bisul- 

 phide displace 4.07 cc. of carbon bisulphide vapor, while on 

 the other 3.69 + 0.04 cc. of air are displaced. 

 Then 



«+/> + <: + 4.07 X 0.00296 = 31.06 + 0.929 + (3.69 + 0.04) 



O.OOI2I3. 



Thus c =0.929 + 3.73 X 0.001213 + 0.66 X 0.001213 —4.07 X 



0.00296 

 = 0- 93 73 grams. 



The number 0.00296 for the density of carbon bisulphide 

 vapor is obtained by substituting, in Clausius' equation for 

 the density of saturated vapors, the values found by Joule 



and Res'nault for E and '-^-. 



d T 



In conclusion it may be remarked that the method is only 



available in the case of a few vapors, on account of the large 



amount of substance used up in the determinations. 



204 



