Chemical Properties of Stannic Chloride. 



483 



of Chemical Change ; being an attempt to apply a Theory of 

 Residual Affinity" (Proc. Roy. Soc. 1886, p. 268), that 

 stannic chloride is not thus simply constituted, but that a 

 condition of more complex aggregation is attained of which 

 the particles could be represented thus : — 



I SnCl 4 | 



v ;„ 



fa 



SnCl 4 | 



| SnCl 4 



where x, y, z may or may not have the same value, and are 

 probably of considerable magnitude. He considers that these 

 groups are built up in virtue of the " Residual Affinity " 

 which he holds to be characteristic of the negative elements. 

 Such a group represented graphically would appear thus : — 



I 

 -CI 



-CI— Sn— Cl- 



I 

 -CI 



-k— 



I 

 — CI— Sn— 01- 



-01- 

 I 



CI 



I 



-CI— Sn— 01- 



_ol_ 



I 



01 



I 

 CI 



.CI— Sn-Cl- 



— ci 



I 

 — ci — - 



— ci— 



-01— Sn-Cl- 



I 

 01— 



.01— Sn— 01- 



I 

 01 



I 



-Cl-Sn— CI- 



Cl— 



I 

 .01— Sn— CI— 



I 

 -CI 



I 



This process of construction would be continued according to 

 the value of x in | SnCL | 



v 'x 



If a value of x =6 be assumed, the aggregation might be 

 completely represented thus : — 



CI 



I 



Cl — Su — ci- 



I 



CI 



Cl- 



I 



Cl— Su — Cl- 



I 



— Cl 



Cl 



Cl 



I 



Cl — Sn — Cl 



I 



Cl 



Cl 



I 



Cl — Su Cl 



I 



Cl 



Cl Su— Cl 



I 



Cl 



Cl 



I 



Cl Su — Cl 



I 



Cl 



