Lessing’s migration to Leipzig, and his temporary absences from the capital in the capacity of tutor, made breaks, but no diminution, in the friendship with Mendelssohn; and the _Literatur-Briefe_, a journal cast in the form of correspondence on art, science, and literature, to which Nicolai, Abbt, and other writers were occasional contributors, continued its successful publication till the year 1765. A review in this journal of one of the literary efforts of Frederick the Second gave rise to a characteristic ebullition of what an old writer quaintly calls ‘the German endemical distemper of Judæophobia.’ In this essay, Mendelssohn had presumed to question some of the conclusions of the royal author; and although the contents of the _Literatur-Briefe_ were generally unsigned, the anonymity was in most cases but a superficial disguise. The paper drew down upon Mendelssohn the denunciation of a too loyal subject of Frederick’s, and he was summoned to Sans Souci to answer for it. Frederick appears to have been more sensible than his thin-skinned defender, and the interview passed off amicably enough. Indeed, a short while after, we hear of a petition being prepared to secure to Mendelssohn certain rights and privileges of dwelling unmolested in whichever quarter of the city he might choose--a right which at that time was granted to but few Jews, and at a goodly expenditure of both capital and interest. Mendelssohn, loyal to his brethren, long and stoutly refused to have any concession granted on the score of his talents which he might not claim on the score of his manhood in common with the meanest and most ignorant of his co-religionists. And there is some little doubt whether the partial exemptions which Mendelssohn subsequently obtained, were due to the petition, which suffered many delays and vicissitudes in the course of presentation, or to the subtle and silent force of public opinion.