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ALS. English translation available. Informs Geoffroy Saint-Hilaire that his present research relates to the heat generated by plants. Dutrochet measures this energy with a thermo-galvanometer, which Becquerel has taught him to use. Thanks Geoffroy Saint-Hilaire for informing him about recent events at the Academy and hopes that such inappropriate scenes will not recur, as they are detrimental to the reputation of the Academy. Comments upon the possible confirmation of the theory that swallows hibernate.

ALS. English translation available. Informs Geoffroy Saint-Hilaire that his present research relates to the heat generated by plants. Dutrochet measures this energy with a thermo-galvanometer, which Becquerel has taught him to use. Thanks Geoffroy Saint-Hilaire for informing him about recent events at the Academy and hopes that such inappropriate scenes will not recur, as they are detrimental to the reputation of the Academy. Comments upon the possible confirmation of the theory that swallows hibernate.