The Ideen signifies a decisive turning point.. in the history of Husserl's phenomenology. In essential parts of the Logische Untersuchungen, which appeared in 1900-1901... the concern was still "pure logic."... In the last two Logical Investigations, however, Husserl is no longer oriented, in a direct and straightforward manner, towards ideal unities, ideal states of affairs, and the like... Instead, especially in the Sixth Investigation, dedicated to "phenomenological clarification of knowledge," the thematic view is reflectively directed to consciousness of idealities... In the Ideen there is also a concern, this time exclusively, for consciousness. Consciousness is understood eidetically as the "eidos consciousness-at-large," so that each de facto consciousness, each de facto mental state, is considered only as a case of, as an example of, consciousness-at-large as well as of its general or species (e.g. perception, memory, phantasy, and again, color-preception, sound perception, etc). From its being factual, no act of consciousnes derives any privilege or priority over what is merely conceived or phantasied, ie..e., possible consciousness. The eidetic inquiry into consciousness and all its most universal structrues is effected now, however, in an attitude which is radically changed over against atttidues pertaining to "natural life" as well as to the positive sicences. As Husserl emphasized in the introduction, everything rests on the comprehension of this change in attitude which was already now and then practiced in the Logische Untersuchungen--but which was not explicitly characterized as such prior to the Ideen. [From Studies in Phenomenololgy and Psychology, p. 107].