Near the table was a cradle with its little curtains drawn. Behind them slept Jean, a fine boy four months old, the son of Pierre and Marie. The latter, simply in order to protect the child's social rights, had been married civilly at the town-hall of Montmartre. Then, by way of pleasing Guillaume, who wished to keep them with him, and thus enlarge the family circle, they had continued living in the little lodging over the work-shop, leaving the sleepy house at Neuilly in the charge of Sophie, Pierre's old servant. And life had been flowing on happily for the fourteen months or so that they had now belonged to one another. There was simply peace, affection and work around the young couple. Francois, who had left the Ecole Normale provided with every degree, every diploma, was now about to start for a college in the west of France, so as to serve his term of probation as a professor, intending to resign his post afterwards and devote himself, if he pleased, to science pure and simple. Then Antoine had lately achieved great success with a series of engravings he had executed--some views and scenes of Paris life; and it was settled that he was to marry Lise Jahan in the ensuing spring, when she would have completed her seventeenth year. Of the three sons, however, Thomas was the most triumphant, for he had at last devised and constructed his little motor, thanks to a happy idea of his father's. One morning, after the downfall of all his huge chimerical schemes, Guillaume, remembering the terrible explosive which he had discovered and hitherto failed to utilise, had suddenly thought of employing it as a motive force, in the place of petroleum, in the motor which his eldest son had so long been trying to construct for the Grandidier works. So he had set to work with Thomas, devising a new mechanism, encountering endless difficulties, and labouring for a whole year before reaching success. But now the father and son had accomplished their task; the marvel was created, and stood there riveted to an oak stand, and ready to work as soon as its final toilet should have been performed.