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A new system of the spleen, vapours, and hypochondriack melancholy wherein all the decays of the nerves, and lownesses of the spirits, are mechanically accounted for. To which is subjoined, a discourse upon the nature, cause, and cure, of melancholy, madness, and lunacy. With a particular dissertation on the origine of the passions; the structure, etc. of the nerves ... To which is prefix'd a philosophical essay concerning the principles of thought