This had been preceded by his treatises "De verbi Britannici futuro ac conjunctivo" (1866), and "De Zeussii curis positis in Grammatica Celtica" (1869). ###>Auparavant, il s’était consacré à deux traités "De verbi Britannici futuro ac conjunctivo" (1866), et "De Zeussii curis positis in Grammatica Celtica" (1869).