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PHRENOTYPIC CLASSIFICATION OF HUMAN STUDIES.
We have just seen that in the business of committing to memory any piece of knowledge, we have always to connect together two notions; and we have also seen above that notions are either familiar or not familiar; hence it follows that in our studies we shall have to connect together either—
| 1. Two notions, each of which is a familiar one. |
| 2. Two notions, one of which is a familiar one, and the other a not-familar one; or, |
| 3. Two notions, each of which is a not-familiar one. |
In symbols I will represent these three kinds of studies, which I will call the three phrenotypic problems, thus—
1. To connect a  with a
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2. To connect a  with a
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| 3. To connect a with a
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