. Human physiology. s, as is done in ordinary bloodletting, the blood shot forth forsome distance. Punctures in the middle of the subclavian dischargedblood, which arose in a full stream, against gravity, two or three inches;sometimes forming an arch as it fell. The coronary veins dischargedblood rapidly and with surprising force. These dissections are con-sidered by Dr. Dowler to show conclusively the independent action ofthe capillaries; which in yellow fever, and other acute fevers, probablysurvives respiration and the hearts action; and when it ceases cada-veric hyperaemia takes place. Suc
. Human physiology. s, as is done in ordinary bloodletting, the blood shot forth forsome distance. Punctures in the middle of the subclavian dischargedblood, which arose in a full stream, against gravity, two or three inches;sometimes forming an arch as it fell. The coronary veins dischargedblood rapidly and with surprising force. These dissections are con-sidered by Dr. Dowler to show conclusively the independent action ofthe capillaries; which in yellow fever, and other acute fevers, probablysurvives respiration and the hearts action; and when it ceases cada-veric hyperaemia takes place. Such is doubtless the fact; but it Versuch einer Darstellmig der Lelire vom Kreislaiif des Blutes, Niirnberg, 1826. 2 A Text-Book of Chemistiy, p. 392, New York, lS4(i; and On the Forces which Pro-duce the Organization of Plants, chap. iii. 3 Researches, Critical and Experimental, on the Capillary Circulation. (Reprintedfrom the New Orleans Medical and Surgical Journal.) January, 1849. IN THE CAPILLAEIES. 421 Fig. may still be questioned, whether anything more than the physicalcapillarity invoked by Professor Draper is concerned in the pheno-menon. In a case observed by the author, and referred to elsewhere,blood flowed freely from the vessels of the brain, and coagulated fifteenhours after the cessation of respiration and circulation; and manysimilar cases are on record. The circulation through the capillaries has long been an interestingtopic of microscopic research. According to Wagner,^ a magnifyingpower of from two to three hundreddiameters is required to make out theparticular details. The blood inmass, or in the larger channels, hesays, is seen to flow more rapidlythan in the smaller. Here the bloodcorpuscles advance with great rapid-ity, especially in the arteries, andwith a whirling motion, and form aclosely crowded stream in the middleof the vessel, without ever touchingits parietes. With a little attention,a narrower and clearer, but alwaysvery distinct space is s
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