 Berlin's responsa collection and his commentary on the Tosefta deserve especial mention, though nothing is known of their fate.Berlin, was the first—at least among the Germans—who showed an interest in the history of post-Talmudic literature; and it was he, who opened the Kalir question (compare his letter to his brother-in-law, Joseph b. Menaḥem Steinhart, in the latter's "Zikron Yosef", No.15.