77. Of the Egyptians themselves, those who dwell in the part of Egypt which is sown for crops 305 practise memory more than any other men and are the most learned in history by far of all those of whom I have had experience: and their manner of life is as follows:⁠—For three successive days in each month they purge, hunting after health with emetics and clysters, and they think that all the diseases which exist are produced in men by the food on which they live; for the Egyptians are from other causes also the most healthy of all men next after the Libyans (in my opinion on account of the seasons, because the seasons do not change, for by the changes of things generally, and especially of the seasons, diseases are most apt to be produced in men), and as to their diet, it is as follows:⁠—they eat bread, making loaves of maize, which they call kyllestis