. Physical chemistry of vital phenomena, for students and investigators in the biological and medical sciences. Biochemistry; Chemistry, Physical and theoretical. VITAL PHENOMENA 59 101 H. Charts showing the hydrogen ion concentration of the stomach (on the ordinate) and time after eating (on the abscissa). Curves 1-4 from same man with different quantities of food. Curve 14 is the average curve for infants. is air, and the drop is hence allowed to drop out of the pipette into the air. The diameter of the dropping surface = to mm (J. L. Morgan, 1915). One form of pipette is Traube's (1
. Physical chemistry of vital phenomena, for students and investigators in the biological and medical sciences. Biochemistry; Chemistry, Physical and theoretical. VITAL PHENOMENA 59 101 H. Charts showing the hydrogen ion concentration of the stomach (on the ordinate) and time after eating (on the abscissa). Curves 1-4 from same man with different quantities of food. Curve 14 is the average curve for infants. is air, and the drop is hence allowed to drop out of the pipette into the air. The diameter of the dropping surface = to mm (J. L. Morgan, 1915). One form of pipette is Traube's (1904) stalagmometer. In its use, the weight of the drop is found by multiplying the volume of the drop by its specific grav- ity, the volume of the drop found by dividing the volume of the pipette by the number of drops from one filling. The pipette is standardized with water, whose surface tension is taken as unity. Therefore the surface tension = specific gravity of solution X no. of drops of water number of drops of solution Traube's (1912) viscostagmeter is a dropping burette with which the volume of say ten drops is measured, and is more rapid than the stalagmometer, which holds forty to 100 drops of water. (Stalagmometers are made to order by Kimball Durand Co., Chicago.) It is the presence of the substance in the surface film which lowers the surface tension, but it is not until diffusion into the surface film has reached an equilibrium that the lowest surface tension is present. For instance, soap very greatly lowers the surface tension of water, but when measurements are taken on new surfaces by the instantaneous method of Rayleigh, the surface tension of the soap solution is found to be the same as. 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 McClendon, J. F. (Jesse Francis), b. 1880. Princeton,
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