The results of the weight method coinside well with those of U-tube method. Although there are many points to be improved in the present apparatus, the author believes that the method is of some value, as it is, for the reason that there are few methods for the measurement of cataphoretic velocity in a heavily concentrated suspension. The author has designed the apparatus operating automatically under the same principle, results of which will be reported in a near future.
It has been experimentally determined that the velocity of reaction between nitrogen and calcium carbide at high temperatures is not directly proportional to the nitrogen-pressure, but there exists the following relation: (Remark: Graphics omitted.) \
oindentwhere P denotes the pressure, K and α certain constants depending upon temperature and other conditions of the reaction. It has also been found that the higher the temperature the greater is the effect of pressure-increase to the velocity of reaction, though the effect of the pressure-increase becomes smaller at higher pressures. At lower pressures the velocity of the reaction is nearly proportional to the pressure.