If the pressure is changed very slowly, the change in the temperature of the gas is imperceptible; if, however, the pressure is removed suddenly, the temperature falls rapidly, or if the pressure is applied suddenly, the temperature rises rapidly.

At length one evening, as the jailer was visiting him for the last time that night, Dantes, with his ear for the hundredth time at the wall, fancied he heard an almost imperceptible movement among the stones.

They had learned to distinguish the almost imperceptible sound of his footsteps as he descended towards their dungeons, and happily, never failed of being prepared for his coming.

As he spoke, he sprang into the vehicle, the door was closed, but not so rapidly that Monte Cristo failed to perceive the almost imperceptible movement which stirred the curtains of the apartment in which he had left Madame de Morcerf.

An imperceptible smile of triumph was expressed on the lips of the procureur.

He offered his hand to the baroness, who, descending, took it with a peculiarity of manner imperceptible to every one but Monte Cristo.

said Albert, who still could not prevent an almost imperceptible cloud passing across his brow.

Haidee turned her eyes towards Monte Cristo, who, making at the same time some imperceptible sign, murmured,``Go on.''

Andrea took the pen with an imperceptible smile and began.

asked Monte Cristo quickly, with an imperceptible gleam of hope.

said Monte Cristo, looking earnestly at the young man, and by an imperceptible movement turning his chair, so that he remained in the shade while the light fell full on Maximilian's face.

All the old constellations had gone from the sky, however: that slow movement which is imperceptible in a hundred human lifetimes, had long since rearranged them in unfamiliar groupings.

By imperceptible degrees, it became a hopeless consciousness of all that I had lost--love, friendship, interest; of all that had been shattered--my first trust, my first affection, the whole airy castle of my life; of all that remained--a ruined blank and waste, lying wide around me, unbroken, to the dark horizon.

While the ear of the former has an external opening, that of the latter is entirely and evenly covered over with a membrane, so as to be quite imperceptible from without.