The "Divine" Plato (of whom Emerson said, "Plato is philosophy, and philosophy is Plato") described the immortal Gods as driving up in chariots through the dome of the heavens to _get upon the roof_, and look abroad at infinite truth, as they stand or drive upon the revolving dome, followed by _ambitious souls who barely get their heads through the roof_ with difficulty, and catch a hasty glimpse of infinite truth, before they tumble back, or lame their wings, or perhaps drop into the body of some brute. The revolving dome and the ambitious souls peeping through the roof, would be a good subject for the next symposium. They might tell us whether these ambitious souls that peep through the roof are Concordian philosophers, or belong to the schools of Aquinas and _Duns Scotus_. The philosophy of the Greeks is worth no more to-day than their chemistry or their physiology. The lingering superstition of believing because they had famous warriors, orators, statesmen, historians, poets, and sculptors, while entirely ignorant of science and philosophy, that their philosophic puerilities are worthy of adoration in the 19th century, a superstition which makes a fetish of the writings of Plato and Aristotle, has been tolerated long enough, and as no one has attempted to give a critical estimate of this effete literature since Lord Bacon did something in that way, I shall not much longer postpone this duty. * * * * * RECTIFICATION OF CEREBRAL SCIENCE.--In the October number the rectification of cerebral science as to psychic functions will be shown by appropriate engravings, showing how far the discoveries and doctrines of Gall and Spurzheim are sustained by positive science. In the further development of the subject, hereafter, the true value and proper position of the discoveries of Ferrier, and the continental vivisectionists will be explained, though but meagre contributions to psychology, they furnish very valuable additional information as to the functions of the brain. HUMAN LONGEVITY. Is not longevity in some sense a measure of true civilization or improvement of the race? It is certainly an evidence of conformity to the Divine laws of life and health, which reward right action with happiness, health, and long life. I cannot, therefore, think the study of longevity unimportant. To every one of us it is a vital question, for death is regarded as the greatest calamity, and is the severest penalty of angry enemies, or of outraged laws.