W. Gibbs on the theory of Atomicities. 413 
Me Asvil 
SbOF,, NaF, Sb \¢ (NaF,), As, OF,, ‘KF, : reat | (KF,), OF, 
F, 
Finally the two remarkable salts discovered by Briegleb and 
which are represented empirically by the formul 
PO@,Na,+NaF+12aq and AsO,Na U+NaP-+12aq 
may at once be reduced to the normal péntatomie type as follows: 
r 1% (Na®), 1 1284, and Ars} (Na®). 1 toaq, 
It is to be remarked that in two of the above formulas, nio- 
bium, and in one arsenic, is represented as heptatomic. In these 
cases each atom of niobium, or of arsenic, loses two units of affin- 
ity in combining with an associate atom of the same elements. 
ee notation employed in this and similar cases is that of 
rankland. 
F on the double fluorids so-called, I pass to the consideration 
of the double chlorids, which, as is well known, are very nu- 
merous. 
A glance at the ree formulas will show the application 
of the principles which I have laid down to this class of com- 
nds, 
HgCl,-++MnCl, ~ Hen (Mn"Cl,)” 
2HeCl,-+BaCl, pair | Ba"“Ol,)"(Cl), 
"Hei 
"He ‘ 
5HeCl, +CaCl, "Hg} (€aC1,)"Cl, 
"giv 
2KCl+HgCl, Hg"(KCl,), 
KCl+-HeCl, Hg"(KCl,)Cl 
| "Het | (KCl 
KCl+-2H¢gCl, ‘ "na ( 2) 
MgCl,+-3HgCl, zh "| (MgCl,) ws 
KO Pt ja 
a ((KCl,)2 
PtCl,+ BaCl, Pt | (picl,y" 
Ptl,--2HI Pt | fnt,), 
(a) 
Ir,Cl,-+-4KCl Bot \« (KCI,),Clz 
