tea 
of the Molecular Structure of the Hydrocarbon Compounds. 93 
constant pressure by half 580° (page 89). If now we analyze, 
after the principles applied to the hydrocarbons, the production 
of the oxides of carbon from amorphous carbon and oxygen 
gas we can readily deduce the following equations, the mean- 
ing of whose terms must be now evident: 
2(C, ae (4) 
(C, 0,)=+ d—o0+00 (5) 
(C,O,) — 2(C, FE aD 200% (Table V). (6) 
Here —oo represents the heat absorbed in dividing the mole- 
cules of oxygen gas, co the heat evolved in the union of atoms 
of carbon each with one atom of oxygen and oco the heat 
evolved in the union of atoms of carbon each with two atoms 
of oxygen. Could Ale assume that in the molecule of carbonic 
dioxide O=C=O the bonds were all of equal value we should 
necessarily have oco=2co, and then from the last equation we 
should at once deduce 
d = 39,200° (7) 
and this being known the values of v, v, v, and v, could at 
once be definitely calculated from the previous equations. 
But although the assumption we have made is highly proba- 
ble, it cannot as yet be proved, and it is possible that 
2co—oco=ax (some unknown quantity), 
and in this case we should have 
d=39,200°--ar, 
a value which is independent of all hypothesis. 
Returning now to the equations of table IV and gay; the 
numerical values of the left-hand member in each of these 
equations from table III, we can at once find 2 sma sub- 
stitution the following values : 
q = 14,867¢ + (8) 
vy = C=C = — 28,230¢ + on (9) 
Vs = O=C = + 688° + 3a (10) 
vy = O=C = + 16,083° + a (11) 
v, = O-C = + 14,805 + 4a (12) 
Then by subtracting we find the thermal values of the 
several bonds, which take the following simple forms 
For the first bond + 14,805° + 4a (13) 
For the second bond + 228 + 4a (14) 
For the third bond — 14,345° + 4a (15) 
For the fourth bond — 28,918° + 42 (16) 
Of course if the probable supposition made above—in regard 
to the constitution of the molecules of CO,—is correct, then the 
terms containing # disappear from all these values. 
