Another word for disquisition

The last chapter but one (181), "De Sancto Pelagio Papa," contains a kind of history of the world from the middle of the 6th century; while the last (182) is a somewhat allegorical disquisition, "De Dedicatione Ecclesiae."
Robertson asserts (Historical Disquisition concerning Ancient India, p. 227) that the Arabs, Turks and Persians have no original name for the compass, it being called by them Bossola, the Italian name, which shows that the thing signified is foreign to them as well as the word.
To these may be added a very short disquisition on the same subject addressed to Adalbold, and a similar one, on one of his own spheres, addressed to Constantine, abbot of Micy.
This tract, the Discours sur les causes de l'extreme cherte qui est aujourdhuy en France (1574), and the disquisition on public revenues in the sixth book of the Republique, entitle Bodin to a distinguished position among the earlier economists.
By way of asserting his right to resume theological disquisition, he also issued in 1798 his Strife of the Faculties, in which all the strongest points of his work on religion were urged afresh, and the correspondence that had passed between himself and his censors was given to the world.

What's another word for disquisition?