Page:Early Greek philosophy by John Burnet, 3rd edition, 1920.djvu/162

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Now, if we can trust this passage, it is of the greatest value; and that, upon the whole, we can trust it is shown by the fact that it follows the exact order of topics to which all the doxographies derived from the work of Theophrastos adhere. First we have the primary substance, then the world, then the heavenly bodies, and lastly, meteorological phenomena. We conclude, then, that it may be accepted with the exceptions, firstly, of the probably erroneous conjecture of Theophrastos as to rarefaction and condensation; and secondly, of some pieces of Stoical interpretation which come from the Vetusta Placita.

Let us look at the details. The pure fire, we are told, is to be found chiefly in the sun. This, like the other heavenly bodies, is a trough or bowl, with the concave side turned towards us, in which the bright exhalations from the sea collect and burn. How does the fire of the sun pass into other forms? If we look at the fragments which deal with the downward path, we find that the first transformation it undergoes is into sea, and we are further told that half of the sea is earth and half of it πρηστήρ (fr. 21). What is this πρηστήρ? So far as I know, no one has yet proposed