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This work is in three parts. In the first, by Dr. Sidis, the subject of personality is treated, the author going through the various types of life to illustrate the development of the individual consciousness. This, of course, is largely psychologic, the view being held that as the organizations pass upward on the scale they become more complex and the possibilities of dissociation more numerous. The constitution of the individual mind, according to the author, is made up of many subordinate individual minds less complex in their nature. There may be, he says, "as many different personalities, parasitic or secondary, as there are possible combinations and disaggregations of psychophysiological aggregates. There may, therefore, be different forms of secondary consciousness or of multiple personality. These may be of a simultaneous character or one of alternation. The personalities may appear side by side or they may appear alternately. The play of personality
Multiple Personality, an Experimental Investigation Into the Nature of Human Individuality.. JAMA. 1905;XLV(9):649–650. doi:10.1001/jama.1905.02510090071025
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