The _serrated_ pulse is indicative of inflammation, and particularly in some tendinous parts. It is no less so of pleurisy, and when slight, indicates that the inflammation is gentle, and easily to be concocted; but when intense, that it is severe and of difficult concoction, and will be attended with urgent danger, if the powers be weak, or, if they be strong, that it will be slowly concocted, for it will either terminate in empyema, or a consumptive marasmus will supervene. One ought also to know that irregularity of the pulse commonly accompanies its inequalities; for you will rarely find an unequal pulse orderly. Wherefore, the lesser constitutional injuries occasion unequal and regular pulses, but the greater, unequal and irregular. These are the simple causes of the pulses and their prognosis, and from them the compound, as we stated when treating of their differences, may easily be discovered. * * * * * COMMENTARY. The ancient authorities on the pulse are the following: Celsus (iii, 6); Galen (Libel. de Pulsi. ad Tirones; de different. Puls., de Dignos. Puls., de Caus. Puls., de Præsag. ex Puls., Synopsis librorum de Puls.); Philaretus (de Pulsu); Theophilus Protospatharius (de Pulsibus ap. Ermerins Anecd. Med. Gr.); Actuarius (de Diagnosi); Avicenna (i, 2, 3); Averrhoes (Collig. iv, 16); Haly Abbas (Theor. vii); Alsaharavius (Theor. vii); Rhases (ad Mansor. x, 32; Contin. xxxi); Psellus (Opus Medicum apud Boissonade, Anecdota Græca.) Prosper Alpinus gives an excellent exposition of the ancient doctrines on the pulse (de præs. Vit. et Morte ægrot. iv, 3); Le Clerc’s account is not so accurate (Hist. de la Méd.) Wetsch’s is tolerably correct (de Pulsu.)