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Note
We testify to what we have seen, and what we testify is true. Since no one can write in books unless they have seen and learned from predecessors or those things that stand on reason: I say, therefore, that an epidemic comes sometimes in warm weather, as in the summer or the beginning of autumn. For this reason, Avicenna Persian polymath (980–1037), in the second Fen section of the first, second doctrine, first summa, chapter nine, says that pestilence and the putrefaction of the air usually come at the end of summer and in autumn. Hence Hippocrates Greek physician (c. 460–370 BC) says in the third book of Aphorisms, aphorism ten, "In autumn, diseases are most acute and most deadly for the most part, but spring is the healthiest and least deadly." The same is said by Rasis Rhazes, Persian physician (865–925) in the fourth book to Almansor, in the chapter on mortality and its caution. And the reason why it comes more then is that the air is then more prepared to receive a bad disposition.