This is from the foreword of The French Language (2nd Ed. 1953) by Alfred Ewert M.A. Litt.D. in the Faber and Faber “The Great Languages” series.
In 1933, when the first edition was published, it was still reasonable to expect that language learning would proceed on an increasingly scientific basis and that a textbook of French for “the upper forms of schools” (i.e. 17 to 18 year olds) would be well written if every section included copious references to historical development from the Latin, with the Appendix of selected texts beginning with “Pro Deo amur et pro christian poblo…”