THE CIRCULATION OF THE BLOOD.
Harvey discovered the circulation of the blood in 1619; but we learn from a passage in Longinus (ch. xxii.) that the fact was known two thousand years before. The father of critics, to exemplify and illustrate the use and value of trope in writing, has garbled from the Timæus of Plato a number of sentences descriptive of the anatomy of the human body, where the circulation of the blood is pointed at in terms singularly graphic. The exact extent of professional knowledge attained in the time of the great philosopher is by no means clearly defined. He speaks of the fact, however, not with a view to prove what was contested or chimerical, but avails himself of it to figure the surpassing wisdom of the gods in constructing the human frame.