Laws of Molecular Force, 



MS 



After giving the values of jjup 2 in the next table we can pro- 

 ceed with the comparison. 



Table XXXIV.— Values of 10 7 /*/> 2 . 





01. 



Br. 



I. 



N0 3 . 



iso 4 . 



ico 3 . 



Li 



432 

 441 

 454 

 443 



464 

 497 

 521 



484 

 496 

 507 

 493 



541 

 550 

 557 

 544 



457 

 468 

 480 

 466 



433 

 444 

 450 

 442 



428 

 437 



Na 



K 



nh 4 



fCa 



iSr 



^Ba 



The experimental data used are those of Rontgen and 

 Schneider (Wied. Ann. xxix.), and those of M. Schumann 

 (Wied. Ann. xxxi.) for CaCl 2 , SrCl 2 , and BaCl 2 , in the case 

 of which I calculated the compressibility for the half-gramme 

 molecule according to his result that /j,—fj, w =cp where p is 

 percentage of salt, using a value of c got from the more con- 

 centrated solutions. 



An inspection of this table shows that 10 7 /u-p 2 possesses the 

 modular property ; it gives for instance the following dif- 

 ferences for Na and Li, 9, 12, 9, 11, 11, with a mean value 10, 

 and so on for the other metals ; the mean values for the metals 

 minus that for Li are : — 



Na. 



10 



20 



NBL 



32 



65 



89; 



and for the negative radicals minus that for CI :- 



Br. 



52 



I. 

 105 



N0 3 



25 



iso 4 . 

 



h0O 3 . 

 -15. 



We can now select pairs of bodies for which A a = A 6 and test 

 ifpapl-^bPl is proportional to cA^-cA" 1 . 



The following are pairs of elements characterized by nearly 

 equal shrinkage on solution with the values of the differences 

 of 10 7 )xp 2 and of cA -1 and also their ratio. 



Table XXXV. 



Equal shrinkage pair... 



K,Na. 



10 

 •29 

 34 



£Sr, iCa. 



£Ba,^Ca. 



Br. CI. 



I, CI. 



N0 3 , CI. 



Meandiff. of 10>p 2 ... 

 Mean cliff, of cA _1 ... 

 Eatio of differences ... 



33 



105 



31 



57 



1-85 



31 



52 



1-56 



33 



105 



3-28 



32 



25 

 •81 

 31 



U2 



