Law of Molecular Force. 



315 



Values of Mx 1000. 





O3H3O, 





C.H^O, 





C,H,A- 



Ill 



591 



589 



nil 



112 



T3 



579 

 542 

 538 



Iso 



IVl 



524 

 501 

 497 

 494 



487 



12.. 



III2 





113 







14 



I iso 4 ... 



Mean 



589 





540 









495 









C,H,A- 





C,H,,0, 



Iso VI 



502 

 470 

 462 

 460 

 453 

 460 



Iso V 



Iso rv 

 III 

 III 

 11^ 



2 





442 

 423 

 434 



425 

 446 





3 





1113 



4 







iso 4 

 ) 





II iso 



i 





15... 















461 









434 









C«H,30,. 





CgHjo. 





CgH^,. 



Iso V3 



409 

 397 

 397 

 407 



Xylol 1 



Xylol 2 



Xylol 3 



1 EthylbeL 





570 

 566 

 590 

 570 



Propylbenzol... 

 Ethyltoluol ... 

 Mesitylene 



521 

 518 

 506 



Iso IV 4 





Iso IV iso 4 ... 

 III5 





izol . . . 







Mean 



402 



1 





574 









515 





















The mean values are taken with the formiates excluded 

 because they depart so markedly from the rest, the formiates 

 evidently tending towards the irregularity of the acids. The 

 mean values are introduced into the following table, in which 

 the values of ^A are arranged according to descending order. 

 The second column contains the formulae with 0' to indicate 

 O connected with two other atoms, 0" to indicate O con- 

 nected with a single atom. Inspection of the table shows 

 that the number of H atoms in the molecule exercises no 

 appreciable influence on the value of kK, and that 0' produces 

 the same eflFect as 2C, and 0" as 3C. In the third column 

 there is placed the number w of C atoms that the molecule is 

 equivalent to, which I shall call its 'parameter equivalent. In 

 the fifth column the mean value of ^-A for a given value of n, 

 or kK : and the last column contains the values of kA. n^. 



