Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
In scientific literature the collection of juristic opinions by Marcus Brutus, which was published about the year 600, presents a remarkable attempt to transplant to Rome the method usual among the Greeks of handling professional subjects by means of dialogue, and to give to his treatise an artistic semi-dramatic form by a machinery of conversation in which the persons, time, and place were distinctly specified. But the later men of science, such as Stilo the philologist and Scaevola the jurist, laid aside this method, more poetical than practical, both in the sciences of general culture and in the special professional sciences.
The increasing value of science as such, and the preponderance of a material interest in it at Rome, are clearly reflected in this rapid rejection of the fetters of artistic form. We have already spoken(32) in detail of the sciences of general liberal culture, grammar or rather philology, rhetoric and philosophy, in so far as these now became essential elements of the usual Roman training and thereby first began to be dissociated from the professional sciences properly so called.
32. Cf. IV. XII. Education
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Reference address : https://www.ellopos.net/elpenor/rome/4-13-literature-art.asp?pg=51