Many attempts have been made to investigate the processes of thought in other ways than in the way described above. At first it was thought that the surest way would be to take as a foundation for the psychological analysis of the thought-processes the laws of logical thinking, as they had been laid down from the time of Aristotle by the science of logic. Scholastic philosophy showed great subtlety in this direction in changing psychical processes into logical judgments and conclusions, and there are still followers of this direction at the present day. Starting with the thought-processes in the narrow meaning of the word, this logical explanation of everything psychical was allowed to spread over to associations, the processes of sense-perception, the pure sensations, feelings, emotions, &c., so that in this old scholastic psychology the human consciousness was in danger of becoming a scholastic philosopher, who regulated each of his actions according to the laws of logic. Now such laws are a late product of scientific thinking, which presupposes a long history of thinking determined by a number of specific factors. These norms, even for the fully-developed consciousness, only apply to a small part of the thought-processes. Any attempt to explain, out of these norms, thought in the psychological sense of the word can only lead to an entanglement of the real facts in a net of logical reflections. We can in fact say of such attempts, that measured by results they have been absolutely fruitless. They have disregarded the psychical processes themselves, and have gained nothing at all for the interpretation of the laws of logic simply because they saw in them the primitive facts of consciousness itself.