Amongst his works in those years were various controversial writings printed in 1523, for instance, that against Cochlæus; also tracts such as those “On the Secular Power” and “On the Adoration of the Sacrament”; also the Instructions on the Supper, on Baptism and on the Liturgy, etc., and, besides these, voluminous circular-letters, translations from, and extensive commentaries on, the Bible. There was also a vast multitude of sermons and private letters. Among the writings on widely differing subjects dealt with by Luther in 1524-25 the following may be specified: “On Christian Schools,” “Two Unequal Commands of the Emperor,” “On Trade and Usury,” “On the Abomination of silent Mass,” “Against the Heavenly Prophets,” “Against the Murderous Peasants,” “On the Unfreedom of the Will.” His publications in the three years 1523-25 number no less than seventy-nine. His attacks on the vow of chastity, and on celibacy, constitute a striking feature of many of his then writings. Obstinacy in the pursuit of one idea, which characterises the German, degenerates in Luther’s case into a sort of monomania, which would have made his writings unreadable, or at least tedious, had not the author’s literary gifts and unfortunately the prurient character of the subject-matter appealed to many. The haste in which all this was produced has left its mark everywhere.[416] In those years Luther’s nerves frequently avenged themselves by headaches and attacks of giddiness for the unlimited demands made upon them. Irregular meals and the want of proper attention to the body in the desolate “black monastery” of Wittenberg also contributed their quota. Among the bodily disorders which often troubled him we find him complaining of a disagreeable singing in the ears; then it was that he began to suffer from calculus, a malady which caused him great pains in later years and of which we first hear in 1526. We reserve, however, our treatment of Luther’s various ailments till we come to describe the close of his life. (See vol. v., xxxv. 1.) We cannot, however, avoid dealing here with a matter connected with his pathology, which has frequently been discussed in recent times. The delicate question of his having suffered from syphilis was first broached by the Protestant physician, Friedrich Küchenmeister, in 1881, and another Protestant, the theologian and historian Theodore Kolde, has brought it into more prominent notice by the production of a new document, which in 1904 was unfortunately submitted to noisy discussion by polemical writers and apologists in the public press. Küchenmeister wrote: “As a student Luther was on the whole healthy. From syphilis, the scourge of the students and knights at that time (we have only to think of Ulrich von Hutten), he never suffered, ‘I preserved,’ he says, ‘my chastity.’”[417]