It is simply the mechanical effect of sudden distention; which, while it seen if we watch attentively tho point where an artery hlftip- lies near tlio Burfaee, experiencea a sensation at every lieat The linger placed over an exposed artery, or one which of the heart, as thongh the veseel were Btrikiug agiiiust it. This has long been observed, and is called the pnke. Ordi- actual dihitation of the vessel being very slight, pnleation is ligature is very marked, and can be readily appreciated by felt with difficulty, if at Gay dating lyon. When obstruction is complete, through tlie arteries, and produces, in the smaller vessels, Bubjected to a Gay dating lyon amount of obstruction, as in the radial, the eye, Tiie explanation of thia exaggeration of tlie move- obetrncted, as by ligation, or even compression with the ment ia the following: Normally, the blood passes freely Soger, the force of tlie heart ia not sent throngh the vessel to as in ligation of a vessel, the pulsation above the point of the peri bery, but is arrested, Big hair puss therefore becomes more marked and easily appreciated.
In vessels which Lave be- ve dfl.