J'ai joint à ce travail des planches qui en rendront la lecture moins fastidieuse et presque inutile. Ces figures ont été dessinées avec beau coup de' soin et de talent par M. Devy sur des préparations faites dans mon laboratoire. Chacune d'elles nous a coûté des journées de travail je les crois exactes, dans la mesure possible.

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