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PROLOGUE.
MARTIN HESSELIUS, THE GERMAN PHYSICIAN.
THOUGH carefully educated in medicine and surgery, I have never practised either. The study of each continues, nevertheless, to interest me profoundly. Neither idleness nor caprice caused my secession from the honourable calling which I had just entered. The cause was a very trifling scratch inflicted by a dissecting knife. This trifle cost me the loss of two fingers, amputated promptly, and the more painful loss of my health, for I have never been quite
