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According to Henning, a new textbook on gastroscopy became indispensable after the rapid spread of gastroscopy resulting from the invention of the flexible gastroscope. This instrument is now used in almost every large German hospital. The technical parts of former books on the subject had become obsolete. The work is based on several thousand gastroscopies; it is written only for gastroscopists. In spite of its brevity, one feels in each sentence the authority of an expert. Morawitz, director of the Medical University Clinic of Leipzig and now editor of the Archiv für Verdauungs-Krankheiten, has written the preface, in which he says: "A certain reserve toward gastroscopy seemed to be comprehensible as long as there were only rigid instruments, but since gastroscopy has become safe today this hesitation is not justifiable any longer.... If it is known that in my hospital several thousands of gastroscopies have been carried out during the
Lehrbuch der Gastroskopie. JAMA. 1935;105(26):2181–2182. doi:10.1001/jama.1935.02760520061025