248 W. Gibbs on the Atomic Weights of Elements, 
HgCl, Hg,Cl, HgBr, Hg, Br,, Fe,Cl,, Al,Cl,, Al,I,, Al,Br,, 
cro, Cl, must be written Si Cl, Ti, Cl, Z . Ch; Sn, Cl,, 
Hg, Cl,, Hg,Cl,, Hg,Br He, is Fetis Al Che Al Pa eet 
Al, Br,, Cr .0 Clos i in order to correspond to 2 vols, of vapor. 
2, All volatile metals and metallic oxyds contain two or four 
received equivalents in 2 vols. of vapor. Thus the vapor-den- 
sities of mercury and So acthen renerens the apes weights 
g,and Cd,. Arsenous and osmic acids correspon n the form 
of vapor to the formulas As, 0, and Os,0,. 
3. All volatile compounds of metals with organic radicals 
contain an even number of equivalents of metal in 2 vols. of 
vapor, excepting only those in which triatomic metals occur. 
us we have corresponding to 2 vols. of vapor the formulas:— 
Sie C,H, 
CH 2 | Zo CH &h Zina, | CoH, t ,Sn., | Cas } S00 
C,H,) (C,H,) C,H C,H,) t 
fe }2 | Sn, 4 Ql? | sna, (C, B? | Sn, (C, u Sn., 
C,H 
(CH) sn, 
4. ithe volatile compounds of the triatomic radicals, nitrogen, 
phosphorus, arsenic, antimony, bismuth and boron, contain m 
2 vols. of vapor only one ein atomic weight of the radical. 
yee we have the compou 
PCl,, AsCl,, SbCl, “BiCh, BCl,, P(C,H,)g, As(CsHs)s 
sve, H,)s; B(C,H,),, BO, 3C,H,0, é&e. &e ee 
To this there are SOAR Thus we bite corresponding to 2 
vols. the formulas 
(C,H, C,H C,H 
As,0,, (C,H oe bai, {G2 a}? t As.09, to ny As,Sz 
5. The specific heats of the atoms of nearly all the gar 
are = if the molecule is in each case referred to 2 vols. 
eae. we consider it proved from the above considerations 4 
Carbon, 12 oe. Le 208 652 
Silicon, 28 lage 108 6°40 
Zirconium, 44 — Rhodium, 102 5°62 
Titanium, 48 — Ruthenium, 106 “ 
Niobium, 96 — Platinum, 198°: 048 
Tantalum, 136 — Tridini, 196 = 700 
Tin, 116 652 Cnninn, "406, eee 
* The only exception to this law occurs carbon, and cannot st 
Bern Seo Ban ead. = a 
a ae ete 
