treatise

tutkielma A formal, usually lengthy, systematic discourse on some subject.
(RQ:EHough PrqsPrc)

“… We are engaged in a great work, a treatise on our river fortifications, perhaps ? But since when did army officers afford the luxury of amanuenses in this simple republic ?(nb..)”

And if someone wants to know how to make objections to actual craftsmen themselves on the subject of art in general or any particular art, there are published treatises available, as you know.