. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. I 944 COMPARATIVE PHYSIOLOGY. curve. 2. A downward curve, rendered irrejfulor by the occur- rence of peaks or cretU and notches. The flrst of these are /V\A/VM/\MAAiWV. Fio, man (after Mneni). x, cnm* nt riso; C, dicrotic McondMr wave; fl, protllcrotlc Becondnry wave; n, notch prccedinu thl»: D, iucceeding lec- ravo. Curve above i» tUat made by a tunlng-furk with ten doable vibn*
. A text-book of comparative physiology [microform] : for students and practitioners of comparative (veterinary) medicine. Physiology, Comparative; Veterinary physiology; Physiologie comparée; Physiologie vétérinaire. I 944 COMPARATIVE PHYSIOLOGY. curve. 2. A downward curve, rendered irrejfulor by the occur- rence of peaks or cretU and notches. The flrst of these are /V\A/VM/\MAAiWV. Fio, man (after Mneni). x, cnm* nt riso; C, dicrotic McondMr wave; fl, protllcrotlc Becondnry wave; n, notch prccedinu thl»: D, iucceeding lec- ravo. Curve above i» tUat made by a tunlng-furk with ten doable vibn* , 908.—Pnlie tracing from carotid artery of healthv mencemont of expannlon of artery; A, inramit of llr tiona •y wi In a second. termed the prodicrotic notch and crest, and the succeeding ones the dicrotic notch and crest The latter seem to be the more constant. Venont PuIm.—Apart from the variations in the caliber of the great veins near the heart, constituting a sort of pulse, though due to variationB in intra-cardiac pressure, a venous pulse proper is rare as a normal feature. One of the best-known examples of such occurs in the salivary gland. When, during secretion, the arterioles are greatly dilated, a pulse may be wit- nessed in the veins into which the capillaries open out, owing to diminution in the resistance which usually is sufficiently great to obliterate the pulse-wave. ^thdogioaL—In severe cases of heart-disease, owing to cardiac dilatation or other conditionB, giving rise to incompe- tency of the tricuspid valves, there may be with each ventricu- lar systole a back-flow, visible in the veins of the neck. A venous pulse is a phenomenon, it will be evident, that always demands special investigation. It means that the usual bounds of nature are for some good reason being overstepped. CSompMntiye.—^Before entering on the consideration of phe- nomena that all are agreed are purely vital, we call attention to the circulation in forms lower than the mam
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