Unfortunately, I have no proof beyond my surmise, unless ” ” With sudden energy, he caught me by the arm, and whirled me down the hall, calling out in French in his excitement: "Mademoiselle Dorcas, Mademoiselle Dorcas, un moment, s'il vous plait!" Dorcas, quite flurried by the noise, came hurrying out of the pantry. 
The he in this line was so excited he slipped into French.
The speaker spoke in English.