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Of digging a canal. Put this in the Book of useful inventions and in

proving them bring forward the propositions already proved. And this

is the proper order; since if you wished to show the usefulness of

any plan you would be obliged again to devise new machines to prove

its utility and thus would confuse the order of the forty Books and

also the order of the diagrams; that is to say you would have to mix

up practice with theory, which would produce a confused and

incoherent work.