Affirming the exsistence of the 3 special heart muscle systems in the auricle, let us imagine them in the Eihthoren's equitriangle. The form of the P wave, which may be found in the left auricular hypertrophy by considering each electrical excitations, caused by the stimulus conduction to the left and right auricle, are proved by the electrocardiogram of mitralstenosis recorded by means of the cathode ray oscillograph, which has the hypertrophy of the left auricle. The characteristic form of the electrocardiogram of this left auricular hypertrophy are 1) the P_I has abnormal large notching, 2) the P are prolonged in each lead, 8) P_<III> are negative or biphasic of which the negativ parts are abnormally large. Some variation may be found in this characteristic when complications come. The diagnosis of the left auricular predominance of the electrocardiogram can be determined when typical even by the string galvanometer.

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The author studied the pulsus differens applying positive pressure on one side of the forearms in arteriosclerotic patients. As for the pulse form, the elastic elevation of the applied side became marked and the incisura showed a tendency to become shallower than that of the other side. The backstsoke elevation showed no appreciable veriation. Such variations of the pulse form on the applied side became marked with the progress of time during the application of pressure. After the release of pressure, these above mentioned variations recovered generally in 3〜5 minutes to the condition which existed before the application, As for the amplitude of pulse curve, the amplitude of the applied side was reduced during the application of pressure and aided the degree of its reduction with progress of time, therefore, the amplitude-difference between both sides became marked. After the release of pressure, the amplitude-difference, which had appeared because of the application of pressure, reduced gradually with progress of time showing two different courses. In the first group, the amplitude on the applied side, which has been reduced during the application, increased gradually, so that the amplitude-differens recovered to the condition which existed before the application. In the second group, the amplitude on the applied side became rather greater than that of the other side in 3〜5 minutes after the release of prassure, and then recoverad to the condition which existed before the application. Comparing the results of this experiment with that of normal persons, which was expressed in the author's previous paper, it can be said that, the pulsus differns appeared because of application of pressure in arteriosclerotic patients is slight in its degree, delayed in its appearance and remained until late compared to that in normal persons. Moreover, in several cases of arteriosclerotic patients, no appreciable pulsus differens because of application of pressure was proved. Observing the difference of reactions in pulse curve between normal persons and arteriosclerotic patients, the author believes that the difference of the elasticity of blood vessels between both groups must be one of the reasons.

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Ringer's solution in which a frog ovary was immersed contained a substance, which markedly accelerated the function of a frog heart. This was a non-albuminous substance, which was stable to heat, easily absorbed by powdered animal-charcoal, difficult to dissolve in alcohol and insoluble in ether.

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The author followed up the momentary change of the photoelectric effect of tin and copper in the atmosphere by means of the autho's photoelectron counter with changeable cathode, in one atmospheric pressure. The author observed that the threshold wave length of tin is longer than 5600Å. Substances which have been discovered till now to have the photoelectric effect by long visible rays, are alkali metals and alkali earth metals, but these metals can not exist in the air. Threfore, the reason why the threshold wave length of tin by the author's experiment is far longer than that by other investigators', is the extremely high sensitivity of the author's apparatus and not impurity of test objects. Adsorpion or absorption of gas and oxydation of a metal surface may cause the change of the photoelectric effect, but further investigation must be performed for dicision in this case.

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The author studied the influence of acetylcholine upon the maximal and minimal blood pressure, pulse curve amplitude and pulse rate, by means of the bloodless method, and obtained the following results. 1) By subcutaneous injection of 0.1mg per Kg, the maximal bood pressure changed, but the minimal blood pressure and pulse rate were almost unchanged. 2) By subcutaneous injection of 2.0mg per Kg, the maximal and minimal blood pressure and pulse curve amplitude decreased in one minute after 5 minutes the maximal blood pressure 30 mm Hg on the average. Pulse rate rather increased. 3) By subcutaneous injection of 10mg per Kg, rabbits fell into a shock-like condition after one minute, pulse curve amplitude became zero. The maximal and minimal blood pressure recovered in 30 minutes to 2 hours. 4) By intravenous injection of 0.01mg per Kg, the minimal blood pressure was almost unchanged, the maximal blood pressure showed a little ascent. 5) By intravenous injection of 0.05mg per Kg, rabbits lapsed into a shock-like condition immediately after injection and the maximal blood pressure recovered in 12 minutes, the minimal blood pressure and pulse curve amplitude in 11.2 minutes on the average. 6) By intraperitoneal injection of 10.0 mg per Kg, the changes worth noting were not observed. 7) From the above mentioned results, the author can see that acetylcholine causes the minimal blood pressure to fall, but that the changes of the minimal blood pressure are smaller in degree in comparison with that of the maximal blood pressure.

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