. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 482 PHYSIOLOGICAL PHYSICS. [Chap, xxxix. For example, while 1 grin, of egg albumen fully oxidised yields 4,998 heat units, the same quantity oxidised to urea yields 4,263 heat units, that is, 735 units less ; and 1 grm. ox flesh completely oxidised yields 5,103, l>ut only 4,368 if oxidised to urea. The quantity of heat capable of being yielded up by the food on complete oxidation must, therefore, be reduced by the amount which the
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. 482 PHYSIOLOGICAL PHYSICS. [Chap, xxxix. For example, while 1 grin, of egg albumen fully oxidised yields 4,998 heat units, the same quantity oxidised to urea yields 4,263 heat units, that is, 735 units less ; and 1 grm. ox flesh completely oxidised yields 5,103, l>ut only 4,368 if oxidised to urea. The quantity of heat capable of being yielded up by the food on complete oxidation must, therefore, be reduced by the amount which the excreta will pro- duce. During bodily repose, the energy due to chemical combination all' appears as heat. If work be done, heat disappears to the extent of the equivalent of the work done. About one-fifth of the total energy of the human body appears as mechanical work, and four-fifths are expended as heat. Apart from chemical actions, there are physical causes at work in the production of heat, the friction of parts, for example, of which, however, it is impos- sible to render an account. The amount of heat liberated by the animal body in a given time has been estimated by various experiments by means of the calorimeter. The apparatus of Dulong is shown in Fig. 197. It consists of a chamber c into which the animal to be experimented on is Placed" chamber is. Fig. of Dulong. immersed in the calori- meter w, made of metal with a bright outer surface and japanned inside, which is itself contained in a much larger wooden case, so that a space M exists be- tween the calorimeter and outer case. The space is stuffed with tow or some such non-conducting material. The case is also higher than the calorimeter, and is. 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 M'Gregor-Robertson, J. (Jose
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