. General physiology; an outline of the science of life. 262 GENERAL PHYSIOLOGY the air of the chamber is expanded by the heat given off by the animal, and from the amount of the expansion the quantity of heat produced may readily be computed. Partly by one method and partly by another, Dulong, Desprez, Helmholtz, Rosenthal, and Rubner, have determined the quantity of heat produced by the animal body. Since all such heat is derived from the chemical energy of the food introduced into the body, and since all the energy of the body, in case the latter performs no work, is. Fig. 117.—Diilong's &q
. General physiology; an outline of the science of life. 262 GENERAL PHYSIOLOGY the air of the chamber is expanded by the heat given off by the animal, and from the amount of the expansion the quantity of heat produced may readily be computed. Partly by one method and partly by another, Dulong, Desprez, Helmholtz, Rosenthal, and Rubner, have determined the quantity of heat produced by the animal body. Since all such heat is derived from the chemical energy of the food introduced into the body, and since all the energy of the body, in case the latter performs no work, is. Fig. 117.—Diilong's "water-calorimeter. A box with double walls; the wide space between the two walls contains water, through which a tube runs in spiral coUs to the interior of the box for the admission of air from the outside at D to the animal, and for the removal of the used air through D'. At T and T' are thermometers. (After Rosenthal.) transformed finally into heat, the quantity of chemical energy that is introduced into the body with the food, expressed in calories, must according to the law of the conservation of energy be equal to the quantity of heat given off from the body to the outside. As a matter of fact, in the experiments this result has been attained with all desired exactness, and thus the validity of the law of the conservation of energy for the living body has been experimentally confirmed. 4. The Production of Electricity As with heat, so thus far the production of electricity cannot be proved upon the single cell, because even our most delicate apparatus is too gross. Here also masses of cells are required. But the production of electricity can be perceived without special means of aid in far fewer cases than the production of heat, since all homo-. 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 Ve
Size: 1822px × 1371px
Photo credit: © The Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bo, bookauthorverwornmax18631921, bookcentury1800, bookdecade1890
