And how much less excuse there is for our generation than for his! We are very far yet from being able to explain the well-known and indisputable facts which occur from time to time, in all countries where men abide and can give an account of themselves; such facts as the phenomena of natural somnambulism, of double consciousness, of suspended sensation while consciousness is awake, and the converse--of a wide range of intellectual and instinctive operations bearing the character of marvels to such as can not wait for the solution. We are still far from being able to explain such mysteries, in the only true sense of the word _explaining_--that is, being able to refer the facts to the natural cause to which they belong; but we have an incalculable advantage over the people of former centuries in knowing that for all proved facts there is a natural cause; that every cause to which proved facts within our cognizance are related is destined to become known to us; and that, in the present case, we have learned in what direction to search for it, and have set out on the quest. None of us can offer even the remotest conjecture as to what the law of the common action of what we call mind and body may be. If we could, the discovery would have been already made. But, instead of necessarily assuming, as the Salem people did, that what they witnessed was the operation of spiritual upon human beings, we have, as our field of observation and study, a region undreamed of by them--the brain as an organized part of the human frame, and the nervous system, implicating more facts, more secrets, and more marvels than our forefathers attributed to the whole body.