This essay forms part of a series in which texts either so far unknown or not easily consulted will be presented and made available to scholars researching into the history of Basque Philology, so that they can receive the close attention they need from linguistic and philological historiogiaphy.
In the presentation of the first in the series -Fl. Lecluse's Grammaire de la langue basque (1826)- the most debated topics are analysed along with the sources and methodology of the author; it is stressed how advanced the work is in respect to both its precursors and its contenporaries, many of its points and conclusions being forerunners of modern ideas.
As a prologue to this edition, the same author's Dissertation sur la langue basque (1826) is also published.