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Benzene, 123 its constitution, 123 _et seq._, 128
Carbon, atomic weight of, 75 specific heat of, 71 tetravalency of, 115
Dumas, Jean B. A., 8, 9, 30, 31, 63, 75, 102, 130
Ether, discovery of its constitution, 12, 17
Gases, kinetic theory of, 83 law of diffusion of, 84, 89 liquefaction of, 94 molecular theory of, 79
Kekulé, Friedrich August, 23, 113, 114, 121, 123, 125, 153
Lactic acid, spatial representation of, 141
Molecules, their number, 93 their size, 93
Nitrogen compounds, stereo-isomerism of, 147
Perkin, Sir William, 3, 129, 131, 132, 162