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those, who from an early age are initiated in the differ-ent branches of learning, have a facility in acquiringsome knowledge of all, from their common connexionwith each other. On this account Pythius, one of theantients, architect of the noble temple of Minerva atPriene, says, in his commentaries, that an architect shouldhave that perfect knowledge of each art and sciencewhich is not even acquired by the professors of any onein particular, who have had every opportunity of improv-ing themselves in it. This, however, cannot be neces-sary ; for how can it be expected that an architect shouldequal Aristarchus as a grammarian, yet should he notbe ignorant of grammar. In music, though it be evi-dent he need not equal Aristoxenus, yet he should knowsomething of it. Though he need not excel, as Apelles,in painting, nor as Myron or Polycletus, in sculpture,yet he should have attained some proficiency in these arts.So, in the science of medicine, it is not required that heshould equal Hippocrates. Thus also, in other sciences, itis not important that pre-eminence in each be gained, buthe must not, however, be ignorant of the general principlesof each. For in such a variety of matters, it cannot besupposed that the same person can arrive at excellencein each, since to be aware of their several niceties andbearings, cannot fall within his power. We see how fewof those who profess a particular art arrive at perfec-tion in it, so as to distinguish themselves: hence, ifbut few of those practising an individual art, obtainlasting fame, how should the architect, who is required tohave a knowledge of so many, be deficient in none ofthem, and even excel those who have professed any oneexclusively. Wherefore Pythius seems to have been in