. Collected essays and articles on physiology and medicine. Medicine; Physiology. ACTION OF THE HEART AND RESPIRATION 87 The pneumogastrics were then feebly stimulated. The pulsa- tions of the heart were diminished in frequency and the instru- ment marked: Pulsations 20 to 30 millimetres. Experiments XVII. and XVIII. demonstrate the ar- rest of the heart's action by stimulation of the pnetmiogas- trics in the dog and turtle. This fact is now established, and the two experiments here recorded are introduced merely to confirm previous observations. Explanation of Illustration The cardiometer is
. Collected essays and articles on physiology and medicine. Medicine; Physiology. ACTION OF THE HEART AND RESPIRATION 87 The pneumogastrics were then feebly stimulated. The pulsa- tions of the heart were diminished in frequency and the instru- ment marked: Pulsations 20 to 30 millimetres. Experiments XVII. and XVIII. demonstrate the ar- rest of the heart's action by stimulation of the pnetmiogas- trics in the dog and turtle. This fact is now established, and the two experiments here recorded are introduced merely to confirm previous observations. Explanation of Illustration The cardiometer is composed of a thick and strong glass bottle, pierced by an iron tube securely soldered, and having an opening (7") by which the mercury which fills the bottle enters. One end of the iron tube is closed, the other projects from the bottle and bends upward in such a way as to receive at («') a glass tube (7^) which is graduated and which is -1*2- to ^ of an inch calibre. At the upper part the bottle is hermetically sealed by a cork pierced by a tube (/) of glass or iron, at the end of which is adjusted a metallic tube (C) designed to enter the vessel in which it is desired to measure the pressure. The tube (C) is joined to the tube (/) by a tube of India-rubber which should be very short. When the instrument is in operation all of the upper part of the apparatus {C e t) is filled with carbonate of soda in order to prevent coagulation of the blood. The level of the mercury is (w) in the bottle, and (;/') in the small tube. This level corresponds to zero, and when the blood presses on the surface of the mercury the pressure is communicated by the opening (T) of the iron tube and the mercury ascends in the graduated glass tube. The length of the tube ( T) should be as great as 250 milli- metres for powerful pressures. (Bernard, " Proprietes et alterations des liquides de I'organisme, tome i., p. 167.) Experiments XIX. and XX. show that when the pneu- mogastrics are divide
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