W. Gibbs on the Hexatomie compounds of Cobalt. 125 
The new salt gives with reagents the reactions of the salts of 
. the octamin series. The relation between the two complex 
atoms which form a molecule of the new salt is worthy of 
ous. We have furthermore the relation expressed by the equa- 
tion: 
Co, (NH), (NOz)_(Coo(NH,) 9(NO,),)=2Co2(NH,)5(NO2) 6: 
Now I shall show, farther on, that there exist several other 
salts, the empirical constitutions of which may be represented 
also by multiples of the formula 
' Co. (NH;),(NOq)¢; : 
so that we have here, for the first time, I believe, in inorganic 
chemistry, a series of strictly metameric bodies. In the salt of 
the octamin series : 
02600 gr. gave 071622 gr. Co 304=23°74 per cent cobalt. 
ing it in quantity. 
Co,C1,N,H,, (old style). I should write this 
Co,(NH,),Cl,; 
and give it the atomistic formula 
NH,—Cl 
NH,—Cl 
°2) NH,—NH,—-Cl 
H, +01 
NH,-—Cl 
It thus forms the type of a special octamin series, the rela- 
tions of which to the salts which I have described are easily 
seen by comparing the formulas which I have give se ha 
not described any other salts of this series. It seems possible 
that my series may be derived from this by acting upon the 
chloride with argentic nitrite; we may have 
Co, (NH,) ,Cl,+-4AgNO,=Co,(NH,)4(NO2),Cl. +448} 
