Freed from the trammeling influence of all metaphysical association and disencumbered of such ideas or expressions as "soul," "sublime intelligence," "spirit," "cosmic consciousness," etc., the study of that particular form of energy to which we refer as mind or mental action grows considerably less perplexing, and permits of speculation and observation from the same point of view as does the investigation of other functions of the same class of cell structure and as we proceed in our contemplation of mind as simply a function of matter, we are struck by the resemblance of the manner and degree in which its variations depend upon variations in form and arrangement of its particular protoplasm, to the manner in which other functions are modified by similar changes in the structures upon which they are dependent.
Now, of all variations in cell structure how clear it should be to us that this one of
McGUGAN A. THE IMPORTANCE OF HEREDITY AS A CAUSE OF INSANITY.. JAMA. 1902;XXXVIII(6):371–376. doi:10.1001/jama.1902.62480060009001b
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