In December I caused a Mare to be tied down alive on her Back, she was fourteen Hands high, and about fourteen Years of Age, had a Fistula on her Withers, was neither very lean, nor yet lusty: Having laid open the left crural Artery about three Inches from her Belly, I inserted into it a brass Pipe whose Bore was one sixth of an Inch in Diameter; and to that, by means of another brass Pipe which was fitly adapted to it, I fixed a glass Tube, of nearly the same Diameter, which was nine Feet in Length: Then untying the Ligature on the Artery, the Blood rose in the Tube eight Feet three Inches perpendicular above the Level of the left Ventricle of the Heart: But it did not attain to its full Height at once; it rushed up about half way in an Instant, and afterwards gradually at each Pulse twelve, eight, six, four, two, and sometimes one Inch: When it was at its full Height, it would rise and fall at and after each Pulse two, three, or four Inches; and sometimes it would fall twelve or fourteen Inches, and have there for a time the same Vibrations up and down at and after each Pulse, as it had, when it was at its full Height; to which it would rise again, after forty or fifty Pulses.
ex Stephen Hales, Statical Essays: Containing Hæmastaticks, 1733
Quoted by HP Dunstan, “Pathophysiology of Systemic Hypertension”
in JW Hurst & RC Schlant, eds, The Heart, Arteries and Veins, 7/e, McGraw-Hill, 1990, p 1149.
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