SPECIFIC GRAVITY AND DISPLACEMENT OF SOME SALINE SOLUTIONS. 145 



occupied by RbOg and K respectively for m= 1/64, 1/128, 1/512, and by K, Rb03 for 

 m= 1/256 ; places 4 and 5 are occupied by Rb and CsOg respectively for m- 1/128, 

 1/256, 1/512, and by CsOg, Rb for m^ 1/64. For nucleus I and m = 1/256, the order 

 of residues is the exact counterpart of that for nucleus Br and m= 1/256, 1/512. In 



Hexagons of the Type m [R]. 



KG. 



KO, 



KO, 



Cs 



Cs 

 Rb 



1/64 

 CI 



RbO„ 



CsO„ 



Cs 

 Rb 



1/128 

 CI 



K 

 Cs 



RbO» 



CsO, 



Cs 

 Rb 



1/256 

 CI 



Rb03 

 CsO, 



Rb 

 K 



1/512 

 CI 



K 



Cs 



K 

 Rb0« 



RbO, 



CsO, 



KG, 



RbO, 



K0„ 



Rb 



1/64 

 Br 



RbOg 



CsO, 



KO, 



Rb 



1/128 

 Br 



RbU, 



CsO, 



Rb 

 KO, 



1/256 

 Br 



Cs 

 CsO, 



Rb 

 KO, 



1/512 

 Bp 



Cs 

 CsOo 



K 



CsO, 



K 

 Rb 



K 

 Rb 



K 



Rb 



■ K 

 RbO, 



1/64 

 I 



Rb 



Cs 



K 



RbO, 



1/128 

 I 



KO, 



CsO, 



Cs 



RbO, 



K 



1/256 

 I 



CsO, 



Cs 



K 

 RbO, 



1/512 

 I 



KO, 



KG, 



CsO, 



Cs 



KG, 



the latter, the residues of type MOg occupy the places with even numbers, and those 

 of type M occupy those with odd numbers ; in the former, the opposite is the case, so 

 that we have the following arrangement of residues in — 



Places numbered 



1/256 and 1/512 [Bp] 

 1/256 [I] 



1 



2 



3 



4 



5 



6 



K 

 KO3 



KO3 

 K 



Rb 



RbOg 



RbOg 

 Rb 



Cs 

 CSO3 



CSO3 



Cs 



1 



§ 65. Turning now to solutions of salts having a metallic nucleus, M, we arrange 

 the hexagons in three lines of four hexagons each, as on the following page. For the 

 top line the nucleus is K, for the middle line Rb, and for the lowest line Cs. In 

 each line the concentrations of the solutions are defined by to=1/64, 1/128, 1/256, 

 and 1/512, in this order. 



TRANS. ROY. SOC. EDIN., VOL. XLIX., PART I. (NO. 1). 19 



