p. 



As. 



Sb. 



Bi. 



B. 



Al. 





C. 



Si. 



Ti. 



Sn. 



•8 



•85 



105 



1-5 



•6 



1-2 



F/4... 



•5 



6 



•95 



•95 



Laws of Molecular Force. 27 



using 2*1 as the value of F, for CI as S, we get the approximate 

 values : — 



Table XVIII. 



P. As. Sb. Bi 



F/3. 



In the compounds of the zinc family irregularities appear 

 in [Wlf : thus for I 2 -C1 2 we get with Zn 2*7, with Cd 1-6, 

 and with Hg(ic) 1*3, instead of the 1*8 proper to dyads : so 

 also are the compounds of Cn(ous) and Ag exceptional, for 

 Cu 2 I 2 — Cu 2 Cl 2 is 3*4 and Agl — AgCl is 1*9; but the reasons 

 for these irregularities can hardly be gone into in the present 

 paper, though in a general way they suggest themselves. 



So far the method of the Kinetic Theory of Solids has been 

 applied to only the haloid compounds of the metals, and it 

 will be interesting to see how it works with compounds in- 

 volving more complicated acid monovalent radicals such as 

 N0 3 , CIO3. The equation (13), which for the haloid com- 

 pounds was shown to simplify down to (9), must for these 

 compounds be used in its original form (13) with k=l/2 : 

 for the nitrates of the form RN0 3 , Mc has a mean value 24, 

 so that (13) becomes 



M 2 / = 5-8x I ^(M/ / >)TM«, . . . .. (15) 



which will be used as near enough for the chlorates, bromates, 

 and iodates, though in them Mc is a little larger. The 

 following are the data for this type of compound : — 







Table XIX. 











Nitrates 











Li. 



Na. 





K. 





Ag. Tl. 



T ,. 



540 



693 





605 





491 478 



M/p ... 



28-9 



39-0 





48-8 





392 459 



(M 2 /f... 



5-8 



71 





8-3 





7-0 7-8 





Chlor 



ates. 



Bromates. 



Iodates. 





Na. 



K. 



Na. 





K. 



Na. K. 



T 



575 



632 



654 



(690) 



(770) 833 



M/p 



430 



52-8 



452 



i 



51-2 



463 55-0 



(M 2 0* ... 



7-9 



8-9 



8-6 





95 



9-7 110 



With the values 2'4 for Li in {Wl)% 35 for Na, and 4't> 

 for K obtained from the haloid compounds, we derive from 

 the last table the following mean values for the parts con- 



