authority imposes on the mind. In the year 1623 Harvey became physician extraordinary to James I., and seven years later was appointed physician to Charles. He followed the fortunes of that monarch, who treated him with great distinction during the first years of the civil war, and he was present at the battle of Edgehill, in 1642. Having been incorporated doctor of physic by the University of Oxford, he was promoted by Charles to the wardenship of Merton College, in 1645; but he did not retain this office very long, his predecessor, Dr. Brent, being reinstated by the Parliament after the surrender of Oxford in the following year. Harvey then returned to London, and resided with his brother Eliat at Cockaine house, in the Poultry. About the time of Charles's execution he gave up his practice, which had never been considerable, probably in consequence of his devotion to the scientific, rather than the practical, parts of his profession. He himself, however, attributed his want of success to the enmity excited by his discovery. After a second visit to the Continent, he secluded himself in the country, sometimes at his own house in Lambeth, and sometimes with his brother Eliat at Combe, in Surrey. Here he was visited by his friend, Dr. Ent, in 1651, by whom he was persuaded to allow the publication of his work on the "Generation of Animals." It was the fruit of many years of experiment and meditation; and, though the vehicle of no remarkable discovery, is replete with interest and research, and contains passages of brilliant and even poetical eloquence. The object of his work is to trace the germ through all its changes to the period of maturity; and the illustrations are principally drawn from the phenomena exhibited by eggs in the process of incubation, which he watched with great care, and has described with minuteness and fidelity. The microscope had not at that time the perfection it has since attained; and consequently Harvey's account of the first appearance of the chick is somewhat inaccurate, and has been superseded by the observations of Malpighi, Hunter, and others. The experiments upon which he chiefly relied in this department of natural history had been repeated in the presence of Charles I., who appears to have taken great interest in the studies of his physician. [Illustration: Harvey demonstrating the Circulation of the Blood.] In the year 1653, the seventy-fifth of his life, Harvey presented the College of Physicians with the title-deed of a building erected in their garden, and elegantly fitted up, at his expense, with a library and museum, and commodious apartments for their social meetings. Upon this occasion he resigned the professorship of anatomy, which he had held for nearly forty years, and was succeeded by Dr. Glisson.