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92 I look upon the cure as absolutely certain.

You are to remember that I had not even commenced to treat Mr. Jennings' case. I have not any doubt that I should have cured him perfectly in eighteen months, or possibly it might have extended to two years. Some cases are very rapidly curable, others extremely tedious. Every intelligent physician who will give thought and diligence to the task, will effect a cure.

You know my tract on The Cardinal Functions of the Brain. I there, by the evidence of innumerable facts, prove, as I think, the high probability of a circulation arterial and venous in its mechanism, through the nerves. Of this system, thus considered, the brain is the heart. The fluid, which is propagated hence through one class of nerves, returns in an altered state through another, and the nature of that fluid is spiritual, though not immaterial, any more than, as I