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up notions are noticed, and others are not, although in reality they do all stand stubbornly before the imagination.
That all the notions that stand before the eye in the same field of vision do all paint themselves upon the retina, although they are not all noticed, has been proved by absolute physical experiments—(artificial eyes, camera obscura, the daguerreotype, &c.:) but that there are notions jumped up, and standing before the eye of the imagination, besides those noticed by us, is, I acknowledge, an hypothesis of my own; an hypothesis which I wish to be believed, relied, and acted upon, for the following reasons:—
| 1. It cannot be proved to be false. |
| 2. It has analogy from the external senses in its favor; and above all, |
| 3. It serves, as we shall see hereafter, a useful purpose. |
COMMITTING TO MEMORY.
The committing to memory languages, sciences, and arts, although it does include various and numberless tasks, is, however, always reducible to one and the same but variously modified problem, viz.—Having agreed upon it that certain two notions
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