FOREWARD
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| | This little treatise is part of a longer work which I began years ago | |
| | without realising my limitations, and long since abandoned. Of the | |
| | various fragments that might have been extracted from what I wrote, this | |
| | is the most considerable, and, I think, the least unworthy of being | |
| | offered to the public. The rest no longer exists. | |
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