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The author refers to the conclusions of Berthelot and Vieille that the phenomenon of the explosive wave is quite distinct from that of ordinary combustion, each being marked by well-defined limits called by them therégime of detonation and combustion respectively. The transition from the one to the other is accompanied by violent vibratory movements. Mallard and Le Chatelier separate the combustion of an explosive mixture inflamed at the open end of a tube, closed at the other, into four different and succeeding phases— (1.) Uniform propagation of flame; (2.) A vibratory movement; followed in some cases by (3.) The explosive wave of Berthelot and Vieille. (4.) Spontaneous extinction of flame.

XXIX. On the induction of the explosive wave and an altered gaseous condition in an explosive gaseous mixture by a vibratory movement