sufficient understanding for these purposes, and, mixing among those of higher rank, are serviceable to the city, as some things, which alone are improper for food, when mixed with others make the whole more wholesome than a few of them would be. But there is a difficulty attending this form of government, for it seems, that the person who himself was capable of curing any one who was then sick, must be the best judge whom to employ as a physician; but such a one must be himself a physician; and the same holds true in every other practice and art: and as a physician ought [1282a] to give an account of his practice to a physician, so ought it to be in other arts: those whose business is physic may be divided into three sorts, the first of these is he who makes up the medicines; the second prescribes, and is to the other as the architect is to the mason; the third is he who understands the science, but never practises it: now these three distinctions may be found in those who understand all other arts; nor have we less opinion of their judgment who are only instructed in the principles of the art than of those who practise it: and with respect to elections the same method of proceeding seems right; for to elect a proper person in any science is the business of those who are skilful therein; as in geometry, of geometricians; in steering, of steersmen: but if some individuals should know something of particular arts and works, they do not know more than the professors of them: so that even upon this principle neither the election of magistrates, nor the censure of their conduct, should be entrusted to the many.