"What shall we do?"

"Take upon yourself to lead them, put yourself at their head; keep them back as long as ever you can, and one of us will go and give General La Fayette warning of the danger the prince is in.... A man shall be sent off post-haste to M. Lhuillier, and the Duc de Chartres set at liberty before you and your men reach Montrouge."

"Good!" said Étienne; "but do not lose any time!"

Then, throwing himself at the head of a group of thirty men—

"To Montrouge!" cried Étienne Arago; "to Montrouge, my friends!"

Each one took up the cry, "To Montrouge!" and they started for the Maine barrière, whilst Nestor Roqueplan—as far I can recollect it was Nestor—ran to the place de Grève.

The Vaudeville lay on the route to the Maine barrière; they went across the Palais-Royal gardens, then crossed the square and threaded their way along the rue de Chartres. A scene-shifter was standing at the theatre door, Arago made a sign with his eyes for him to come up to him; the man understood and did so. Arago pretended to be receiving some confidence from the man.

"Good! my friends," he said; "here is a fresh business. You don't know what I have just heard! He says there is a Royalist conspiracy to come and burn down the Vaudeville, and, as you are aware, the insurrection started from the Vaudeville: had we not better begin by searching the theatre first?"

No objections were raised. Besides, many of those honest fellows were not at all displeased at the thought of seeing the inside of a theatre; only the man who had proposed the journey to Montrouge, who was a cooper from the quartier du Roule, tried to raise objections; but nobody listened to him. So they stopped at the Vaudeville, and Arago, lantern in hand, conducted his men from the lowest pit to the galleries; he did not spare them a single post, or trap-door, or side-scene. A whole hour was wasted over this visit. They then continued their course towards the Maine barrière.

Meanwhile, General La Fayette had been warned and had sent off to Montrouge M. Comte, one of the most brilliant students of the École polytechnique, who has since written a capital work on Positive Philosophy. M. Comte was the bearer of a letter couched in the following terms:—