There is a case recorded by M. Bergson,[8] in which a hypnotised boy is said to have been able to state correctly the number of the page in a book held by the observer, by reading the corneal image of the figures. The actual figures were three millimetres high, and their corneal image is calculated by M. Bergson to have been O.1 mm., or about 1/250 of an inch in height! In some other experiments conducted by M. Bergson with the same subject the acuteness of vision is said to have exceeded even this limit. In another case, recorded by Dr. Sauvaire,[9] a hypnotised subject was able to recognise the King of Clubs, face downwards, in two different packs of cards. In the first of these cases the results, which could not have been attained by the senses under normal conditions, must apparently be attributed to hyperæsthesia. Instances, especially of auditory hyperæsthesia, are of course quite familiar to those who have studied the phenomena of hypnotism. In Dr. Sauvaire's case, however, the power of distinguishing the cards by touch may have been the result of practice. Mrs. Verrall records (_Proceedings Soc. Psych. Research_, vol. viii. p. 480) that she acquired such a power by means of "a longish series of experiments"; and Mr. Hudson, in _Idle Days in Patagonia_, tells of a gambler who by careful training had developed the same faculty in a very high degree. It seems probable in the cases described by M. Bergson and Dr. Sauvaire, and possible also in the case of Mr. D.'s subject, that there was no intentional deception, and that the hypnotised person was not himself aware of the means by which his knowledge was attained.[10] The same remark probably applies to the following case, in which, though the conditions of vision were certainly unusual, it seems not clear whether the degree of success attained should be attributed to abnormal sensibility of the eyes, or to the facility acquired by long practice. In a series of experiments at which the writer assisted, in 1884, an illiterate youth named Dick was hypnotised, a penny was placed over each eye, and the eyes and surrounding features were elaborately bandaged with strips of sticking-plaster; a handkerchief being bound over all. Under these conditions Dick named correctly objects held in front of him, even at a considerable distance, a little above the level of his eyes. Normal vision appeared to be impossible. Mr. R. Hodgson, however, repeated the experiment upon himself, and found after several trials that he also could see objects, though fitfully and imperfectly, under the same conditions, the channel of vision being a small chink in the sticking-plaster on the line where it was fastened to the brow.