250 W. Gibbs on the Atomic Weights of Elements. 
It is however to be remarked that, of the other elements, at 
least two, namely copper and mercury, are monatomic in certain 
combinations, as for example, in Cu,Cl and Hg,Cl. It is true 
that we may write these formulas Cu,Cl, and Hg,Cl,, in which 
case we have two additional diatomic forms of copper and mer- 
cury with the atomic weights 126 and 400 respectively. This 
ode of viewing the subject obliges us to admit atomic heats 
represented nearly by the number 12, or twice as high as in 
of the other elements, and appears therefore less simple than 
that first stated. 
- 
other arguments in favor of the same change. 
pares oxyd of zine Zn,O,, with oxyd of ethylene (C,H,)03' 
the hydrate of oxyd of zinc will then correspond to glyco) 
n 
H, O,. In the same way we may consider hydrate of ses- 
quioxyd of iron as corresponding to glycerine, Fe 0; = 
a 3 
C,H een : : 
"H: O,, Fe, being here triatomic. 
Should the further progress of the science show that the views 
above mentioned are the most simple and consistent expressio2 
* Limpricht. Lehrbuch der i i . 
4 Giusy J cura al the Oneal Badioey ool oF im : and 3. 
The same, vol. xiii, p. 124, : : : yt 
Ann. de Chimie et de Physique, lx, 239, and Repertoire de Chimie p™*® 
| 0 
nuovo Cimento, vii, 321. I have not seen the original paper and quote * 
hand from the Jahresbericht of Kopp and Will for 1858, p. 12 q 
