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separate from perceptible magnitude, it must be admitted that all subjects of cogitation are in perceptible forms, as well those termed abstractions as those which relate to the conditions and changes of the objects of perception. And, therefore, if a being were without sentient perception, he could neither learn nor understand; as for reflexion the individual must be able to call up an image of some sort, and images are kinds of sensations, excepting that they are immaterial. Imagination, on the other hand, is something different from affirmation and negation, for the true or the false is but a complication of thoughts. But by what are primal thoughts to be distinguished from such as are derived from images? Other thoughts, however, are not images, and yet without images they could not be produced.