500 



C. Barus — Fluid Volume and its 



of these substances are 195° and 234°, respectively. Hence 

 ether shows an imaginary # even at 185°, and both liquids do 

 so at 310°. 



Table 21. 

 Exponential constants. Direct computation. 



Substance. 



6 



#xl0 6 

 31800 



axlO 3 



10 3 x 



2-3 #/a 



Substance. 



6 



tfxlO 6 



ax 103 



10 3 x 



2-3 #/a 



Ether 



310 



280 



261 



Benzoic ) 











#o=100 



185 



1130 



12-0 



217 



Acid [ 



185 



140 



1-4 



230 





100 



361 



3-8 



218 



#o = 20 ) 













65 



225 



20 



259 



Paraffine 



310 



362 



32 



260 





30 



167 



1-6 



240 



#o = 20 



185 



180 



1-8 



231 



Alcohol 



310 



15000 



140 



247 





100 



113 



1-1 



232 



#o = 150 



185 



351 



3-9 



207 





65 



89 



•8 



256 





100 



164 



2-0 



189 



Thymol 



310 



466 



4-7 



230 





65 



116 



1-2 



223 



#o=20 



185 



163 



1-6 



234 





30 



88 



•6 



336 





100 



100 



1-2 



191 



Palmitic Acid 



310 



332 



3-0 



250 





65 



74 



•7 



243 



i>o = 20 



185 



160 



1-5 



245 





28 



65 



•6 



248 



Para- 



100 



65 



310 



104 



89 



421 



1-0 



.8 

 45 



238 

 257 

 215 



Monobrom ) 



Camphor [• 



#o=20 ) 



185 

 100 



121 



82 



10 



•5 



280 

 376 



Toluidine 



185 



145 



1-7 



196 



a-Naphtol ( 

 #o=20 J" 



185 



86 



•8 



246 



po=20 



100 



82 



•4 



470 



100 



63 



•7 



207 





65 



68 



•5 



315 



Vanilliue ) 

 Po=20 \ 



185 



96 



•9 



235 





28 



57 



•3 



440 



100 



59 



•5 



271 



Diphenyl- 



310 



216 



2-0 



248 



Azo-Benzol ) 

 #o=20 J" 



185 



130 



1.2 



250 



amine 



185 



113 



1-2 



217 



100 



80 



•8 



229 



#o = 



100 



68 



•5 



311 











. 



65 



62 



•3 



470 



Mean 2-3#/a= 



=•25 



7 ±-008 







Caprinic Acid 











..-_ ; 





*/ 



a = -lll 



9=1/9 nearly. 



#o=20 



185 



100 



65 



30 



201 



114 



92 



77 



1-9 

 1-0 



•7 

 •7 



243 

 263 

 303 

 252 ; 













The last column 2*3 d-/a is of special interest. Looking at 

 these results as a whole and taking the enormous range of 

 variation fully into account, it appears that # and a are not 

 only closely related, but that this relation is linear. The 

 values 2 '3 #/a, though frequently irregular show no consistent 

 grouping It is also to be remembered that the computation 

 of table 21 was an entirely independent procedure. Values 

 more nearly in keeping with the mean ratio d-/a could easily 

 have been obtained had I entered into the work with any bias. 

 Hence it is justifiable to regard the equation 



v/V=ln (l+9Bp) 1 / 9 



as applicable to the whole series of organic substances ex- 

 amined. With this point of departure I made a recalculation 

 of #, and have inserted the results in tables 4 to 14 above. 

 Table 22 contains additional substances. 



