What is "treatises"

Usage examples of "treatises".

Let us listen to the scrupulous analysis whose lessons, scattered through four thousand pages, teach us more concerning instinct and its innumerable variations than all the most learned treatises and speculations of the philosophers.

He got so few chances of reading his treatises to anybody, that he could not bear to let this priceless opportunity slip by.

The earl devoted himself to the study of the ancient Greeks and Romans and produced imposing books and treatises that were well received by people who knew about that sort of thing.