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40 of the good Pliny, though it be that wonderful piscis, the Echinus, which though but a cubit long has such tenacity of grip and purpose that it holds fast the largest galley, and with the resistance of its fins, renders impotent the efforts of a hundred rowers. Fish for Pliny also are all the stories of antiquity, of dog-headed, one-legged, big-footed men, of the Pigmies and the Cranes, of the Phoenix and the Basilisk. He delights in the more intricate causality of nature's phenomena, and tells how the bowels of the field-mouse increase in number with the days of the moon, and the energy of the ant decreases as the orb of Venus wanes. But this credulous person was a marvel of curiosity and diligence, and we are all his debtors for an acquaintance with the hearsay opinions current in the antique world.

Varro and Pliny were encyclopaedists. Yet before, as well as after them, the men possessed by the passion for knowledge of the natural world, were frequently devoted to some branch of inquiry, rather than encyclopaedic gleaners, or universal philosophers. Hippocrates, Socrates's contemporary, had left a name rightly enduring as the greatest of physicians. In the third century before Christ Euclid is a great mathematician, and Hipparchus and Archimedes have place for ever, the one among the great astronomers, the other among the great terrestrial physicists. All these men represent reflection and theory, as well as investigation and experiment. Leaping forward to the second century A.D., we find among others two great lovers of science. Galen of Pergamos was a worthy follower, if not a peer, of the great physician of classic Greece; and Ptolemy of Alexandria emulated the Alexandrian Hipparchus, whose fame he revered, and whose labours (with his own) he transmitted to posterity. Each of these men may be regarded as advancing some portion of the universal plan of Aristotle.

Another philosophy, Stoicism, had already reached a wide acceptance. As for the causes of this, doubtless the decline of Greek civic freedom before the third century B.C., had tended to throw thoughtful men back upon their inner life; and those who had lost their taste for the popular religion, needed a philosophy to live by. Stoicism became