Page:Lives of British Physicians.djvu/315

 PARRY. 293 pulse is a strong and predominant impulse of dis- tension from the systole of the left ventricle of the heart, given by the blood as it passes through any portion of an artery forcibly contracted within its natural diameter ; and that the visible pulse is sometimes owing to a locomotion of the vessel, unconnected with contraction and dilatation. Dr. Parry's experiments also demonstrate the curious fact of an entire reproduction of the larger arteries, in cases where large portions of the caro- tids in sheep had been cut out, or where the arte- ries had been tied by ligatures. The various doctrines and opinions of this au- thor have been, as it was natural to expect, sub- jected to the severe tests of critical scrutiny and examination. The last effort of his pen was a reply to the observations of Dr. Wilson Philip, in a Letter addressed, 1816, to the Editor of the " Medical and Chirurgical Review." A consi- deration of the objections and arguments which have been opposed to Dr. Parry's doctrines appears in a work of his son, published in 1819, and en- titled, " Additional Experiments on the Arteries ;" and more particularly in a preface and introductory volume to the posthumous writings of Dr. Parry, published by the same editor, in 1825. Without wishing to enforce an entire and unqualified defer- ence to the opinions of his father, this latter author considers himself " excused for an attempt, in connexion with the republication of Dr. Parry's former works, and the publication of much new matter, to rescue him from objections which ap- pear to have been advanced in haste, in ignorance, or in error." In this preface, an account is given