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102 apparently no limit to this power to perceive suggested hallucinations. Edmund Gurney, following the example of some Continental hypnotists, caused by this means a lifelike apparition of himself to appear to an astonished servant girl.

But the spontaneous hallucinations of normal healthy persons are more pertinent to our present enquiry than these post-somnambulic visions. The late Professor Sidgwick, at the instance of the Congress of Experimental Psychology which met in Paris in 1889, with the aid of a committee of members of the Society for Psychical Research, instituted a census of spontaneous hallucinations of the sane. In the course of three or four years 17,000 persons, the greater part resident in the United Kingdom, were questioned on the subject. The results showed that 655 out of 8372 men, and 1029 out of 8628 women, or 9.9 per cent. of the