It remains now only to briefly consider how Harvey's great discovery was received. To quote the words of one writer: "So much care and circumspection in search for truth, so much modesty and firmness in its demonstration, so much clearness and method in the development of his ideas, should have prepossessed everyone in favor of the theory of Harvey; on the contrary, it caused a general stupefaction in the medical world and gave rise to great opposition." During the quarter of a century which elapsed after Harvey's announcement there probably was not an anatomist nor physiologist of any prominence who did not take active part in the controversy engendered by it; even the philosopher Descartes was one of the first adherents of the doctrine of the circulation, which he corroborated by experiments of his own. Two years after the appearance of Harvey's book appeared an attack, composed in fourteen days by one Primerose, a man of Scotch descent, born and educated in France, but practising at Hull, in which he pronounced the impossibilities of surpassing the ancients or improving on the work of Riolan, who already had written in opposition to Harvey, and who was the only one to whom the latter vouchsafed an answer. It was Riolan who procured a decree of the Faculty of Paris prohibiting the teaching of Harvey's doctrine. It was this same Riolan who combated with equal violence and obstinacy the other great discovery of the age, namely,--the circulation of the lymph. One of the earliest and fiercest adversaries of Harvey's theory was Plempius, of Louvaine, who, however, gave way to the force of argument and who finally publicly and voluntarily passed over to the ranks of its defenders in 1652, becoming one of Harvey's most enthusiastic advocates. Harvey's conduct through the controversy was always of the most dignified character; in fact, he rarely ventured to reply in any way to his adversaries, believing in the ultimate triumph of the truths which he had enunciated. His only noteworthy reply was one addressed to Riolan, then Professor in the Paris Faculty and one of the greatest anatomists of his age, to whose opinion great value was always attached. Even in debating or arguing against him, Harvey always spoke of him with great deference, calling him repeatedly The Prince of Science. Riolan was, however, never converted, though whether he held to his previous position from obstinacy, from excess of respect for the ancients, or from envy and jealousy of his contemporary, is not known. Another peculiar spectacle was afforded by one Parisunus, who died in 1643, a physician in Venice, who, like Harvey, had been a pupil of Fabricius of Aquapendente, who had been stigmatized by Riolan as an ignoramus in anatomy, but who joined with others in declaring that he had seen the heart beat when perfectly bloodless, and that no beating of the heart and no sounds were to be heard as Harvey had affirmed.