In some other respects, however, his knowledge was more
accurate: he coincides with Herodotus in his description of the Caspian
Sea, and expressly states that it ought to be called a great lake, not a
sea. A short period before Aristotle flourished, that branch of geography
which relates to the temperature of different climates, and other
circumstances affecting health, was investigated with considerable
diligence, ingenuity, and success, by the celebrated physician Hippocrates.
In the course of his journeys, with this object in view, he seems to have
followed the plan and the route of Herodotus, and sometimes to have even
penetrated farther than he did.
Pytheas, of Marseilles, lived a short time before Alexander the Great: he
is celebrated for his knowledge in astronomy, mathematics, philosophy, and
geography, and for the ardour and perseverance with which either a strong
desire for information, or the characteristic commercial spirit of his
townspeople, or both united, carried him forward in the path of maritime
discovery. The additions, however, which he made to geography as a science,
or to the sciences intimately connected with it, are more palpable and
undisputed, than the extent and discoveries of his voyages.
He was the first who established a distinction of climate by the length of
days and nights: and he is said to have discovered the dependence of the
tides upon the position of the moon, affirming that the flood-tide depended
on the increase of the moon, and the ebb on its decrease.
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