 He spent five years of laborious study, almost living in the libraries of Paris and unmoved by the turmoils that agitated the world around him, including Napoleon's escape, the Waterloo campaign and the Restoration.The first paper from his years of study in Paris appeared in Frankfurt am Main in 1816, under the title of "Über das Konjugationssystem der Sanskritsprache in Vergleichung mit jenem der griechischen, lateinischen, persischen und germanischen Sprache (On the Conjugation System of Sanskrit in comparison with that of Greek, Latin, Persian and Germanic)", to which Windischmann contributed a preface.In this first book, Bopp entered at once the path on which he would focus the philological researches of his whole subsequent life.