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His published writings include: Die Scholien des Gregorius Abulfaragius Bar Hebraeus zum Weisheitsbuch des Josua ben Sira... (1892); Das Wesen des juedischen Religionsunterrichts (1904); Wesen des prophetischen Judentums (1907); Abraham Geigers religioeser Charakter (1911); Die muendliche Lehre und ihr Dogma... (2 vols., 1922–23); Weltschoepfungsaera und Wissenschaft (1928); and Sendschreiben an den Vorstand... der Vereinigung traditionell-gesetzestreuen Rabbiner Deutschlands, in which he opposed the custom of abbreviating the name of God in non-Hebrew languages. Kaatz was a regular contributor to Wohlgemuth's Jeschurun and the weekly Israelit. He also wrote short stories (Alter Vogel, 1919) and a play, Alexander der Grosse vor Jerusalem.