The Greek Grammar of Roger Bacon

Oxford Grammar: page 81, the names of the Beast Referring to the Beast in the Book of Revelation = Compendium original: "Compendium Studii Philosophiae", book 6, page 437.
Page 92, Mountain brass original: "Orichalcum", with the quotations from Horace and Virgil = Lesser Work original: "Opus Minus", page 385; Compendium, book 7, page 453.
Page 107, Canopy original: "Conopeum", tomb original: "mausoleum", and tax office original: "theloneum", quoting Juvenal and Lucan = Third Work original: "Opus Tertium", chapter 63, page 258.
Page 131, Nothing original: "nichil" and To me original: "michi" These are medieval spellings of the Latin words "nihil" and "mihi" = Third Work, chapter 61, page 245.

The instances listed above are not a complete list. However, they show the similarity in both method and subject matter between this grammar and passages in Bacon's other works. Almost every passage in this grammar has a parallel in his other writings. Often, these parallels use nearly the same words. Other points also suggest that Roger Bacon is the author of the Oxford Grammar.

References to Hebrew.

We know that Bacon severely condemned the scholars and clergy of his time. This was due to their ignorance of Greek and Hebrew. He repeatedly pointed out the harm caused by neglecting these languages. This neglect injured the spread of knowledge and the Church. He often reminded his readers that all science was originally revealed to the ancient Hebrews. From them, it passed to the Egyptians and the Greeks. The Latins did not create a single branch of learning themselves... "philosophy was first handed down primarily and completely in the Hebrew language" original: "prima tradita (philosophia) est principaliter et complete in lingua Hebraea" (Third Work, chapter 10, page 32). "And it was not handed down by others, nor was it ever created among the Latins." original: "Et non fuit (philosophia) ab aliis tradita, nec unquam apud Latinos facta"

¹ See S. A. Hirsch, "Early English Hebraists: Roger Bacon and his predecessors." This appeared in the Jewish Quarterly Review, 1899, volume 12, pages 51 and following.