American journal of physiology . to the rightjugular vein the blood-pressure was raised again. The stimulation of thedepressor was repeated, the artificial respiration being stopped during eachstimulation period. Blood-pressure before stimulation of depressor nerves. Blood-pressurelowered to Fallper cent 80 ram. 50 mm. 38 65 40 38 87 55 37 70 50 29 70 50 29 76 8084 5048 53 34 40 37 Remarks. More salt solution injected. With artificial respiration. Without artificial respiration. (Note that suspending theartificial respiration duringthe period of observationdoesnotimpairthe method.) This record
American journal of physiology . to the rightjugular vein the blood-pressure was raised again. The stimulation of thedepressor was repeated, the artificial respiration being stopped during eachstimulation period. Blood-pressure before stimulation of depressor nerves. Blood-pressurelowered to Fallper cent 80 ram. 50 mm. 38 65 40 38 87 55 37 70 50 29 70 50 29 76 8084 5048 53 34 40 37 Remarks. More salt solution injected. With artificial respiration. Without artificial respiration. (Note that suspending theartificial respiration duringthe period of observationdoesnotimpairthe method.) This record is reproduced inFig. 5- Relation of Depressor Nerve to Vasomotor Centre. 295 Figure 4 is a photographic reproduction of the alteration in theblood-pressure curve produced by the simultaneous stimulation ofboth depressor nerves while the splanchnic nerves were still con-nected with the vasomotor centre. In this figure the uppermost line is the curve of blood-pressure inthe carotid artery. It was drawn by a membrane manometer the. Figure 4. — October 26, 1899. Original size. The uppermost line was drawn by amembrane manometer connected with the carotid artery. The graduation scale ofthis manometer is reproduced on the right. The middle line marks atmosphericpressure; it was drawn by the writing point of an electro-magnetic signal which alsorecorded, by a white band, the simultaneous stimulation of both depressor lowest line marks the time in seconds. The artificial respiration was suspendedduring the observation. The splanchnic nerves had been prepared for experimenta-tion, but were not yet separated from the vasomotor centre. On stimulating thedepressors the blood-pressure fell from 75 mm. to 38 mm, (49 per cent). graduation scale of which appears on the right of the figure. Themiddle line marks the atmospheric pressure; the broad white linerecords the simultaneous stimulation of both depressor nerves. Thelowest line gives the time in seconds. The artificial respir
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