286 



Mr. William Sutherland on the 



Br and CI ; the square of the molecular weight of KBr is 

 divided by this sum and multiplied by -00593 to give the 

 tabulated value of Wl in terms of the megamegadyne. From 

 the value of Wl thus found the dynic equivalent S is calcu- 

 lated by the relation M 2 Z=6$, which has been seen to be 

 appropriate to values of Wl obtained from solutions. 



Table XXXVIL— Values of Wl and S. 





01. 



Br. 



I. 



N0 3 . 



§so 4 . 



ico 3 . 





Wl S. 



M.H. S. 



Wl. 



S. 



M 2 ^. 



S. 



Wl. 



S. 



Wl. S. 



Li ... 



125 21 



18-7 3-1 



25-7 



4-3 



17-1 



2-8 



10-6 



1-8 





Na ... 



13-7 2-3 



20-8 3-5 



28-0 



4-7 



18-8 



31 



12-8 



2-1 



8-6 1-4 



K ... 



18-5 3-1 



28-3 4-7 



32-4 



54 



235 



39 



172 



2-9 



12-8 21 



NH 4 



23-0 3-8 



27-0 4-5 



31-0 



5-2 



25-0 



42 



170 



2-8 





We 



104 1-7 



17-7 30 



251 



4-2 



156 



2-6 



101 



1-7 





±Ca... 



120 20 



19-4 3-2 



26-7 



45 



173 



2-9 









£Sr... 



14-2 24 



21-8 3-6 



29-3 



4-9 



19-5 



3-2 









Pa... 



18-8 3-1 



26-4 4-4 



33-9 



5-6 



240 



4-0 









Pn... 



12-5 2-1 













12-6 



21 





^Cd... 



15-7 2-6 



23-2 3-9 



30-5 



5-1 



21-0 



3-5 



16-2 



2-7 





|Mn 



11-5 1-9 









16-8 



2-8 



11-7 



2-0 





To these may be added the following :- 





AgN0 3 . 



|Pb(N0 3 ) 2 . 



£CuS0 4 . 



£FeS0 4 . 



£NiS0 4 . 



M 2 l...... 



S 



30-6 

 51 



26-3 

 4-4 



11-5 

 1-9 



11-4 

 1-9 



12-3 

 2-0 







iCoS0 4 . 



Hi 2 (so 4 ) 3 . 



-|Fe 2 (S0 4 ) 3 . 



*Cr 2 (S0 4 ) 3 . 



~Wl 



12-7 



8*9 



12-fi 



9-fi 



S .... 



2-1 





1 



•5 





21 





1-6 



The additive principle holds amongst both sets of numbers 

 except in the case of NH 4 ; see for instance the following list 

 of the differences of S for the iodides and chlorides : — 2*2, 2'4, 

 2*3, 2*5, 2*5, 2*5, 2*5, 2'5. Now we have already seen that 

 the modular principle applies to cA _1 (the modular principle 

 applies when a quantity is given by the addition of moduluses 

 to a constant, the additive principle is a special case of the 

 modular in which the constant is zero) ; the additive principle 

 applies to M the molecular weight : hence it would appear 



