. Mécanisme animal : un traité sur la locomotion terrestre et aërial. Animal locomotion ; Vol. 34 MÉCANISME DES ANIMAUX. cylindre soit maintenue, les courbes de conserver la même forme aussi longtemps que le muscle donne les mêmes mouvements. Non seulement les chocs produits dans le muscle en agissant sur son nerf par l'électricité, mais aussi par l'application de l'excitation électrique pour le muscle lui-même. Pincements, percussion, et la cautérisation du nerf sont aussi excitants qui provoquent des chocs du muscle. Le caractère de ces mouvements sous certaines modifications en- fluences. La fatigue du muscle, le circuit de refroidissement de cet organe, le s

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. Animal mechanism: a treatise on terrestrial and aërial locomotion. Animal locomotion; Flight. 34 ANIMAL MECHANISM. cylinder be maintained, the curves retain the same form so long as the muscle gives the same movements. Not only are shocks produced in the muscle by acting upon its nerve by electricity, but also by applying electric excitement to the muscle itself. Pinching, percussion, and cauterization of the nerve are also excitants which provoke shocks of the muscle. The character of these movements changes under certain in- fluences. Fatigue of the muscle, the cooling of that organ, the stoppage of circulation in its interior, modify the form of the shock, diminish its force, and augment its duration. Under these influences the myographic curve passes through different forms, such as 1, 2, 3, Fig. 4.. Fig, 4.—Character of the shock, accordmg to the degree of fatigue of the muscle : 1, muscle fresh ; 2, muscle a little fatigued ; 3, muscle still more fatigued. Among the different species of animals, the durations of the shock vary considerably; in the bird they are very brief (two to three hundredths of a second). In man they are longer ; in the tortoise and hybernating animals longer still. Certain poisons modify the characteristics of this movement in so special a manner, that the slightest traces of those poisons introduced into the circulation of the animal may be disco- vered in the form of the tracings. By Fig. 5, we may judge of the successive forms which will be assumed by the shocks of the muscle of a frog, under the influence of a gradual absorption of veratrine. These experiments still reveal only one fact: it is that the muscle is shortened or lengthened by a movement whose. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Marey, Etienne-Jules, 1830-1904. New York, D. Appleton a

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