These are not matters on which I have to dwell, but I think the present work would be incomplete without a record of those men of original mind, whose acute observation and unwearied investigations in the past have indissolubly linked their names with discoveries which have revolutionised the practice of both medicine and surgery. In the opinion of Solomon, "there is nothing new under the sun;" and if such was the case in his day, how much more of a verity must be the truism in ours. So the most startling and perfect revelation of any great fact in human physiology may have been dimly perceptible to earlier intelligences groping in the dark, faint adumbrations of which may fall on the sensorium of the final discoverer, until a ray of divine light dispels the mists of ages, and the man, developing his crude idea with infinite pains, realises a great truth, and cries out "Eureka" to an astonished--and too often--an unbelieving world. Thus it may have been with the renowned practitioner, WILLIAM HARVEY, who came into the world when all England was filled with alarms of an "Invincible Spanish Armada," then preparing to devastate our shores and spare neither man nor maid, babe nor mother. Yet the scare passed and peace came, and the boy grew, until his educational course at Cambridge ended, and his bias led him towards Padua, then the great seat of academical and medical lore, and there he took his doctor's degree in physic. With the prestige of Padua upon him, in 1607, when he was but twenty years of age, he was elected Fellow of the College of Physicians (founded by Dr. Linacre in the reign of Henry VII.), and in 1715, the man of twenty-eight became their Anatomical Reader. A noteworthy appointment this, since consequent study and investigation led to the grand discovery that the heart--to speak unscientifically--was a sort of muscular pumping-engine, sending the blood circulating along a series of blood-vessels to every part of the system, changing in character on its course until it returned to its centre, the seat of life, to be pumped out afresh to circulate as before and do its appointed work. In 1628, Harvey made his discovery known in a learned treatise "On the circulation of the blood," and as may be supposed, his daring assertions roused a violent spirit of opposition amongst his medical brethren, even among those who began to feel the pulses of their patients for the first time, and to comprehend _why_ there should be a fluttering or audible beating under the sick one's ribs, and wherefore the fatal hemorrhage following a sword-thrust or a gunshot wound. In spite of opposition his teaching created a revolution in medical practice. The discoverer was called before Charles I. and his Court to demonstrate the action of the heart and subsidiary organs, in support of his new doctrine.