Leon ran to light the fire under the boiler, and M.
Nibor created him Fireman, on the field of battle.
Soon a jet of tepid vapor streamed into the bath-room, creating around the Colonel a humid atmosphere which was elevated by degrees, and without any sudden increase, to the temperature of the human body.

These conditions of heat and humidity were maintained with the greatest care for twenty-four hours.

No one in the house went to sleep.

The members of the Parisian Committee encamped in the laboratory.

Leon kept up the fire; M.Nibor, M.Renault and M.Martout took turns in watching the thermometer.