. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. chap, xxii.] DIALYSIS. 261 dialyser (a, Fig. 117) is then floated in a vessel con- taining a considerable quantity of distilled water. The crystalloids will readily pass through, but colloids will be perfectly retained. Liebig described, years before, an arrangement not dissimilar to this. " If O we tie moist paper over the open end of a cylindrical tube, and, after pour- ing in above the paper white of egg to the height of a fe
. The elements of physiological physics: an outline of the elementary facts, principles, and methods of physics; and their applications in physiology. Biophysics. chap, xxii.] DIALYSIS. 261 dialyser (a, Fig. 117) is then floated in a vessel con- taining a considerable quantity of distilled water. The crystalloids will readily pass through, but colloids will be perfectly retained. Liebig described, years before, an arrangement not dissimilar to this. " If O we tie moist paper over the open end of a cylindrical tube, and, after pour- ing in above the paper white of egg to the height of a few lines, place that end of the tube in boiling water, the albumen is- coagulated ; and when the paper is removed, we have a tube closed with an accurately-fitting plug of coagulated al- bumen, which allows neither water nor brine to run through. If the tube be now filled to one-half with O brine and immersed in pure water, the brine is seen gradually to rise, and in three or four days it in- creases by from a quarter to one-half of its volume, exactly as if the tube had been closed with a very thick ; * The dialyser affords a means of purifying colloidal matter from crystalloids. The mixture requires only to be placed in the dialyser on water, and the crystal- loids are separated out. Albumen may be purified in the same way. It was urged by Graham that the method of dialysis could with advantage be applied in medico-legal cases to- the separation of such crystal- loids as arsenious acid from organic solutions, such as the contents of the stomach, blood, etc. Strychnine and tartar emetic were separated in the same way. While the dialyser shows albumen to be very feebly diffusible, peptones are largely so. Mechanism of absorption.—There can be no doubt that osmosis plays an important part in ab- sorption, even though it may not explain the whole of the process. Let the conditions be observed. In * Liebig " On the Motion of the Juices in the Animal Body,"
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