[Illustration: VICTORY OF SAMOTHRACE (Louvre, Paris) Commemorates a naval battle fought in 306 B.C. The statue, which is considerably above life-size, stood on a pedestal having the form of a ship's prow. The goddess of Victory was probably represented holding a trumpet to her lips with her right hand. The fresh ocean breeze has blown her garments back into tumultuous folds.]
SCIENTIFIC DISCOVERIES
The Hellenistic Age was remarkable for the rapid advance of scientific knowledge. Most of the mathematical works of the Greeks date from this epoch. Euclid wrote a treatise on geometry which still holds its place in the schools. Archimedes of Syracuse, who had once studied at Alexandria, made many discoveries in engineering. A water screw of his device is still in use. He has the credit for finding out the laws of the lever. "Give me a fulcrum on which to rest," he said, "and I will move the earth." The Hellenistic scholars also made remarkable progress in medicine. The medical school of Alexandria was well equipped with charts, models, and dissecting rooms for the study of the human body. During the second century of our era all the medical knowledge of antiquity was gathered up in the writings of Galen (born about 130 A.D.). For more than a thousand years Galen of Pergamum remained the supreme authority in medicine.
ANCIENT AND MODERN SCIENCE COMPARED
In scientific work it seems as if the Greeks had done almost all that could be accomplished by sheer brain power aided only by rude instruments. They had no real telescopes or microscopes, no mariner's compass or chronometer, and no very delicate balances. Without such inventions the Greeks could hardly proceed much farther with their researches. Modern scientists are perhaps no better thinkers than were those of antiquity, but they have infinitely better apparatus and can make careful experiments where the Greeks had to rely on shrewd guesses.
EXTENSION OF GEOGRAPHICAL KNOWLEDGE
During the Hellenistic Age men began to gain more accurate ideas regarding the shape and size of the habitable globe. Such events as the expedition of the "Ten Thousand" [17] and Alexander's conquests in central Asia and India brought new information about the countries and peoples of the Orient. During Alexander's lifetime a Greek named Pytheas, starting from Massilia, [18] made an adventurous voyage along the shores of Spain and Gaul and spent some time in Britain. He was probably the first Greek to visit that island.
ERATOSTHENES, ABOUT 276-194 B.C.
All this new knowledge of East and West was soon gathered together by Eratosthenes, the learned librarian of Alexandria. He was the founder of scientific geography. Before his time some students had already concluded that the earth is spherical and not flat, as had been taught in the Homeric poems. [19] Guesses had even been made of the size of the earth. Eratosthenes by careful measurements came within a few thousand miles of its actual circumference. Having estimated the size of the earth, Eratosthenes went on to determine how large was its habitable area. He reached the conclusion that the distance from the strait of Gibraltar to the east of India was about one-third of the earth's circumference. The remaining two-thirds, he thought, was covered by the sea. And with what seems a prophecy he remarked that, if it was not for the vast extent of the Atlantic Ocean, one might almost sail from Spain to India along the same parallel of latitude.
[Illustration: PROGRESS OF GEOGRAPHICAL KNOWLEDGE IN ANTIQUITY
Map, The World according to Eratosthenes, 200 B.C.
Map, The World according to Ptolemy, 150 A.D.]