of the Molecular Structure of the Hydrocarbon Compounds. 97 
energy to break one of the bonds if the other is left unimpaired, 
although it requires an energy measured by 14,770° to break 
the last. While if the atoms are united by three bonds there 
is as strong a tendency to break away at the’first bond as there 
is to hold together at the last bond. 
property of these substances. 
stly, in the acetylenes the same tendency is still more 
strongly marked ; for in the molecules of these bodies two of 
the carbon atoms are united by a treble bond, and the parting 
of either one or of two of these bonds is attended with a 
development of energy which is added to that resulting from 
the normal attraction of the carbon atoms for other radicals 
ut the molecular structure of none of the more complex 
tion to this fg) a In the last number of the Berichte der 
esellschaft (Oct. 25, 1880), the expected results 
i to 
the three types of isomeric derivatives of benzol. These 
