I have preferred giving additional and unpublished evidence of the wonderful control which can thus be “suggestively” exercised over the belief of a person in trance-umbra, to quoting Professor Gregory’s most interesting cases, for which the reader must consult his recent valuable work. In the sixth letter in the present volume, (that on Somnambulism,) I have exemplified the manifestation of the same phenomena in the case of the sleep-walker Negretti. As a large number of persons can be thrown easily into the state of trance-umbra; and as then they are totally in the power of the operator, it is surely most desirable that this and the parallel easily induced conditions of the frame should be made subjects of careful observation and study by many competent persons, in order that the conditions necessary to their induction may be exactly ascertained, and made public, for the protection of society. Of equal interest is the discovery that clairvoyance may be manifested in the state of trance-umbra. Major Buckley is spoken of by Professor Gregory as a gentleman possessing mesmerising force of a remarkable quality and degree. It appears that he had been long in the habit of producing magnetic sleep, and clairvoyance in the sleep, before he discovered that, in his subjects, the sleep might be dispensed with. Dr. Gregory gives the following account of his present method:— “Major B. first ascertains whether his subjects are susceptible, by making, with his hand, passes above and below their hands, from the wrist downwards. If certain sensations, such as tingling, numbness, &c., are strongly felt, he knows that he will be able to produce the magnetic sleep. But to ascertain whether he can obtain conscious clairvoyance, he makes slow passes from his own forehead to his own chest. If this produce a blue light in his face, strongly visible, the subject will probably acquire conscious clairvoyance. If not, or if the light be pale, the subject will only become clairvoyant in the sleep, (that is, when in perfect trance.) Taking those subjects who see a very deep blue light, he continues to make passes over his own face, and also over the object—a box or a nut, for instance—in which written or printed words are enclosed, which the clairvoyante is to read. Some subjects only require a pass or two to be made: others require many. They describe the blue light as rendering the box or nut transparent, so that they can read what is inside. This reminds us of the curious fact mentioned by Von Reichenbach, that bars of iron or steel, seen by conscious sensitives, without any passes, shining in the dark with the Od glow, appeared to them transparent like glass. If too many passes are made by Major B., the blue light becomes so deep that they cannot read, and some reverse passes must be made to render the colour of the light less deep. Major Buckley has thus produced conscious clairvoyance in eighty-nine persons, forty-four of whom have been able