1.

We will now proceed to examine the statements made by Posidonius in his Treatise on the Ocean. This Treatise contains much geographical information, sometimes given in a manner conformable to the subject, at others too mathematical. It will not, therefore, be amiss to look into some of his statements, both now and afterwards, as opportunity occurs, taking care to confine ourselves within bounds. He deals simply with geography, when he tells us that the earth is spheroidal and the universe too, and admits the necessary consequences of this hypothesis, one of which is, that the earth contains five zones.