The First Use of Chemical Graphs

It was probably after seeing such diagrams that the Irish chemist, William Higgins, had the inspiration of representing the forces between the constituent components, i.e. the atoms, of molecules. In a book 

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Close on the heels of the first use of chemical graphs for the representation of individual molecules, came the realization that the same graphs could be of great value in the discussion of isomerism. As mentioned above, chemical graphs provide information only on the topolo cal positions of atoms and not on their physical positions in the molecules. Such graphs are therefore well suited to the enumeration... 

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