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WORKS BY THE SAME AUTHOR: Published by D. Appleton & Company.

The Physiology of Man; designed to represent the Existing State

of Physiological Science as applied to the Functions of the Human Body. Volume I., Introduction ; Blood; Circulation; Respiration.

1 vol., 8vo, pp. 500. Cloth, $4.50, sheep, $5.50. The same, Vol. II., Alimentation; Digestion ; Absorption ; Lymph and

Chyle. 1 vol., 8vo, pp. 550. Cloth, $4.50; sheep, $5.50. The same, Vol. III., Secretion ; Excretion; Ductless Glands; Nutrition;

Animal Heat; Movements; Voice and Speech. 1 vol., 8vo, pp. 520.

Cloth, $4.50; sheep, $5.50. The same, Vol. IV., The Nervous System. 1 vol., 8vo, pp. 470. Cloth,

$5.50; sheep, $5.50. The same, Vol. V., Special Senses; Generation. 1 vol., 8vo, pp. 517.

Cloth, $4.50; sheep, $5.50. The same, complete in 5 vols. Cloth, $22.00; sheep, $27.00. A Text-Book of Human Physiology; designed for the use of

Practitioners and Students of Medicine. Illustrated by three Lithographic Plates, and three hundred and thirteen Woodcuts. 1 vol.,

imperial 8vo. Cloth, $6.00; sheep, $7.00. Recherches expérimentales sur une nouvelle fonction du

foie, consistant dans la séparation de la cholestérine du sang et son élimination sous forme de stercorine (séroline de Boudet), Paris, Germer Bailière ; and New York, D. Appleton & Company, 1868. 1 vol., 8vo. pp. 122. Price $0.75.

This work received an “ Honorable Mention" with a “ Recom. pense" of 1,500 francs from the Institute of France (Académie des

Sciences), in 1869, Concours Montyon (Médecine et Chirurgie). On the Physiological Effects of Severe and Protracted Mus

cular Exercise ; with special reference to its Influence upon the

Excretion of Nitrogen. 1871. 1 vol., 8vo, cloth. pp. 91. Price $2.00. Manual of Chemical Examination of the Urine in Disease ;

with brief Directions for the Examination of the most common Va. rieties of Urinary Calculi. Fifth edition, 1877. 1 vol., 16mo, cloth, pp. 76. Price $1.00.

ON

THE SOURCE

OF

MUSCULAR POWER.

ARGUMENTS AND CONCLUSIONS

DRAWN FROM

OBSERVATIONS UPON THE HUMAN SUBJECT,
UNDER CONDITIONS OF REST AND OF

MUSCULAR EXERCISE.

BY

AUSTIN FLINT, JR., M. D.,

PROFESSOR OF PHYSIOLOGY AND PHYSIOLOGICAL ANATOMY IN THE BELLEVUE
HOSPITAL MEDICAL COLLEGE, NEW YORK; FELLOW OF THE NEW YORK
ACADEMY OF MEDICINE; MEMBER OF THE MEDICAL SOCIETY
OF THE COUNTY OF NEW YORK; CORRESPONDENT OF
THE ACADEMY OF NATURAL SCIENCES OF

PHILADELPHIA, ETC., ETC.

NEW YORK:
D. APPLETON AND COMPANY,

549 & 551 BROADWAY.

1878.

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PREFAOE.

Ar the present time, there are few questions relating to physiology, of greater interest and importance than the one which is the subject of this essay. Since the publication of the experiments of Fick and Wislicenus, in 1866, a large number of observations have been made, which are brought forward as evidence that the muscular system of a fully-developed man or other animal is simply a perfected mechanical apparatus, like an artificially-constructed machine, which accomplishes work, not at the expense of its own substance, the material consumed being restored by food, but by using the food itself, the force-value of which can be accurately calculated, as we can calculate the dynamic value of the fuel consumed in a steam-engine. These observations have led some physiologists to

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