余は50名の健康男女につき上膊・橈骨・固有掌側指三動脈脈波を比較し,且,三動脈部間の脈波傳播速度を檢索せるに,1.脈波各棘の高さに關しては第一棘を除き小截痕,第二棘,截痕は末梢部に到る程低くなり,第三棘は末梢部程その高さを増す.2.脈波超始點より各波に到る時間間隔に關しては末梢部に到るに從ひ時間間隔を短縮す.而してその短縮は第二棘に對するもの最小なり.3.脈波速度は上膊・橈骨兩動脈間に於て平均917糎秒にして,同例に對する橈骨・固有掌側指兩動脈間の速度は平均991糎秒なり.實驗に際し其指導と便宜を賜はりたる京都帝國大學醫學部内科第三講座眞下教授に深厚の感謝を捧げ,併て同前川助教授の熱心なる御援助に深甚の謝意を表す.

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著者は被檢物質を犬血液とし,之れに何等機械的影響を與ふることなく,純音傳導を以て血液凝固の状態變化を連續的に,且單純に記録し,得たる第3圖に示すが如き記録寫眞より其の曲線の解析を可能ならしむるに便ならしめ,延いて血液凝固能の研究に資せり.本論文の要旨は第三回日本循環器病學會總會(第十回日本醫學會第二十二分科會)に於て報告せり.本研究及び實驗に際し其指導を賜りたる恩師京都帝國大學醫學部内科學第三講座眞下教授に深厚の感謝を捧げ,併せて終始援助を與へられたる同講座前川助教授に深甚の謝意を表す。

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1) The author measured the threshold wavelength of the photoelectric effect of human blood. 2) The experiments gave the following results : - The threshold wavelength of the photoelectric effect of the blood of healthy persons is longer than 3150 A and shorter than 4300 A in every case of the experiments. On the contrary, however, the threshold wavelength of the photoelectric effect of the blood of the patients with pulmonary tuberculosis is longer than 3150 A and shorter than 4300 A in eight cases out of thirteen, and in five cases it is longer than 2500 A and shorter than 3150 A. 3) It is considerable that the quantity of albumin in blood may influence the threshold wavelength of the photoelectric effect of human blood, because albumin is the only photoelectrically active substance by long visible rays among the ingredients of blood. This reasoning is proved by the fact that the threshold wavelength of the photoelectric effect of the wet human blood, measured immediately after the arrangement, is longer than 2000 A and shorter than 2500 A in every case of the experiments, because the smaller the humidity of albumin, the longer the threshold wavelength of photoelectric effect of it. The cordial thanks of the author are due to Prof. Toshikazu Mnshimo, M. D. and Assist. Prof. Magoziro Maekawa, M. D. for their kind guidance.

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The author injected the aqueous solutions of potassium acetate of various concentrations, each 0.5 cc per Kg, in rabbits and obtained systematically their effect on the blood pressure and pulse over a long period. Intravenous injection of 4.9 % solution caused immediately an average decrease of 15 mm Hg (10.7 %) in the maximal blood pressure and an average of 8 mm Hg (11.5 %) in the minimal blood pressure. These changes were restored to normal value after the average lapse of 16 minutes. By intravenous injection of 9.8 % solution, the maximal blood pressure fell on the average by 22 mm Hg(11.5 %) and the minimal blood pressure fell on the average by 13 mm Hg (16.6%), immediately after the injection, thereafter both these rapidly recovered to the normal value. The pulse curve amplitude generally decreased immediately after the injection. By intravenous injection of 13% solution, the maximal blood pressure was decreased on the average by 38 mm Hg (27.1 %) and the minimal blood pressure was decreased on the average 19 mm Hg (25.5 %), immediately after the injection, and within 5 minutes they were restored to the original value. Thereafter the maximal blood pressure showed a slight increase and then decreased gradually. No marked change was obtained in the pulse curve amplitude and an average decrease of 27 (11.2 %) was obtained in the pulse rate immediately after the injection. The changes which were caused by subcutaneous injection of 16.3 % solution were rather dilatory. The maximal blood pressure showed an average decrease of 16 mm Hg (11.3 %), the maximal decrease, immediately or in 5 minutes after the injection and then increased gradually. The minimal blood pressure changed almost simultaneously with the maximal and the maximal decrease was on the average 10 mm Hg(12.5 %). Usually 20 minutes after the injection, an average decrease of 3.7 mm (31.2 %) was caused in the pulse curve amplitude and this was the largest decrease. The pulse rate generally showed no recognizable change.

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