508 



C. Barns — Fluid Volume and its 



are to be compared. The two sets of results then exhibited 

 the upper and the lower limit of the isothermal band, § 25. I 

 will omit the new results here and confine myself to a state- 

 ment of the degree of accordance. 



Hyperbolic constants. 



Table 30. 

 Mean values, vj V~fip/(\ + 4/5 up). 



Substance. 



e 



//xlO 6 



Substance. 



d 



(i x 10 6 



Ether 



29 



167 



Diphenyl amine 



65 



64 



- 



65 



229 





100 



69 





100 



354 





185 



112 





*185 



1220 





310 



216 



Alcohol 



28 



89 



Paraffine 



65 



88 





65 



115 





100 



112 





100 



163 





185 



181 





185 



340 





310 



382 



Para-Toluidine 



28 



59 



Thymol 



28 



66 





65 



69 





65 



73 





100 



86 





100 



97 





185 



141 





185 



162 





310 



412 





310 



481 



* Equation begins to fail. 



In case of ether the divergence, or the width of the band at 

 1000 atm. is 4 per cent at 28°, 1 per cent at 65° and at 100°. 

 At 185° the hyperbole begins to fail. Constructing the 

 isometrics for %> and 0, when V c =l, it is seen that whereas for 

 the exponential formula (2) the straight line is predicted as far 

 as 185° and 1300 atm., this is not the case with the hyperbolic 

 equation, for which the isometrics are straight only below 100° 

 and 700 atm. 



The conformity of results for alcohol is better throughout. 

 At 1000 atm., the divergence at 28° is nil; at 65° it is 2 per 

 cent ; at 100°, *3 per cent ; at 185°, 2 per cent. When . V c =l, 

 the exponential relation is satisfied by linear isometrics as far 

 as 185° and 1500 atm. The hyperbola admits of this only 

 below 100° and 700 atm. 



Divergences in case of paraffine at 1000 atm. is *1 per cent 

 at 65°, *2 per cent at 100°, '7 per cent at 185°, 6 per cent at 

 310°. As far as 185° and 900 atm. both isometrics are linear. 

 At 310° both show curvature, toward opposite sides of "the 

 common line. The exponential is in better agreement. The 

 divergence at 1000 atm. in case of diphenylamine is *1 per cent 

 at 65° and at 100°, *2 per cent at 185°, I per cent at 310°. 

 The linear isometrics hold almost to 310°. Thymol at 1000 

 atm. shows a divergence of '1 per cent at 28°, *2 per cent at 

 65°, 1 per cent at 100°, -6 per cent at 185°, 3 per cent at 310°. 

 Finally, para-toluidine at 1000 atm. shows a divergence of nil 

 at 28° and 65°, *3 per cent at 100° and at 185°, 3 per cent at 

 310°. 



