 Frege’s third anti-psychologistic discussion is his 1894-review of Husserl’s Philosophie der Arithmetik (1891). I shall not here enter into the debate over whether it was Frege’s criticism that turned Husserl away from psychologism (cf. Kusch 1995, 12–13). Nor shall I try to adjudicate whether Frege’s critique was justified. Suffice it here to point out that Frege’s review classifies Husserl as a psychological logician on the grounds that Husserl treats the meanings of words, concepts and objects as different kinds of ideas (1894, 316); that Husserl provides psychological-genetic accounts of the origins of abstract concepts (1894, 317); and that Husserl, like Erdmann, equivocates on the notion of idea: in some places in his book, concepts and objects are understood as subjective, in other places they are taken to be objective (1894, 318). In his criticism of Husserl’s psychological explanation of the genesis of the number concept, Frege does not confine himself to contrasting Husserl’s theory with his own account of numbers. He also points out that the various psychological processes which Husserl’s theory assumes are spurious. For instance, Frege denies that we can combine any arbitrary contents into one idea without relating these contents to one another. He also rejects Husserl’s claim that we can abstract from all differences between two contents and still retain their numerical distinctness (1894, 316, 323). 