By Raphael Salem

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And in nuclear physics too we cannot dispense with the assumpare tion of repulsive and attractive forces. The principle that "two bodies cannot be in the same place" holds good in one form or another for all circumstances and in all dimensions. C. and which, despite the many different forms assumed by it, has remained essentially unchanged down to the the scientific present day. One —that of seeing the — of these basic principles cosmos in terms of number and measure will be more fully discussed in the second chapter.

In fact, it is impossible to conceive of the cosmos as controlled by only one force: the forces must wax and wane alternately, as stated in another fragment of Empedocles' poem: "As they [Love and Hate] were formerly, so also will they be, and never, I think, shall infinite Time be emptied of these two" [42]. The side quotation from Aristotle [48] is of special interest, because, side with the opposed forces, it mentions the concept of by "necessity". This is one of the concepts employed by Ancient 18 THE SCIENTIFIC APPROACH Greek science to express the causal connections between phenomena.

Reports: c/ "Formerly, in the time of Pythagoras and his mathematical means were known the arithmetical, the geometrical and a third which was first called 'subcontrary'. This last was subsequently renamed 'harmonic' by the school of Archytas and Hippasus because it embraces harmonic ratios" [26]. For the sake of completeness it should be added that the Pythagoreans also discovered the harmonic mean in the dimensions of the cube: "There are those who say that it should be called a harmonic mean, after Philolaus, because it inheres in the whole of geometrical harmony.