have been the subject of careful experiments at the French Metaphysical Institute during a period of several months, those who assisted being pledged to silence until a decision had been reached. The particular phenomena produced by or in his presence were chiefly characterized by the radiation of an extraordinary light about his person. At the end of 1922 two papers appeared in _La Revue Métapsychique_ on the part of Dr. Sanguinetti and Dr. William Mackenzie of Genoa indicating their assurance (1) that every scientific precaution had been taken, and (2) that the phenomena were genuine. However, the experiments seem to have continued and later there appeared in _Le Matin_ an enthusiastic contribution by Dr. Stephen Chauvet, which caused Dr. Gustave Geley, Director of the Metaphysical Institute, to come forward in confirmation of the testimony. It is only fair to add that immediately afterwards Dr. Geley to a certain extent retracted his statement, as he suggested that the psychic lights could be produced with _ferro-cerium_, and it was thought that traces of this substance could be found on Erto’s clothes. The medium protested his innocence of any deception, and offers himself for further experiments. A writer in _Psychica_ is inclined to believe that the phenomena were genuine, but that later some fraud may have been practised owing to waning power. This is possibly the case, for that the radiations were at first supernormal cannot, I think, be gainsaid in view of the high testimony adduced. For this phenomenon Mr. Cecil Hush and Mr. Craddock have sat repeatedly; of the extraordinary manifestations of the late Eusapia Palladino there can be no reasonable doubt at all; the materializations of Mlle “Eva Carrère,”[117] although on several occasions not altogether successful, are at other times supported by the strongest evidence; Nino Pecoraro, who is described as “a remarkably muscular young Neapolitan,” is famous for “ectoplasmic effects”; and Stanislava P., Willy S., the Countess Castelvicz, and very many more psychics possess these supernormal powers, although, as we might expect, they have to be used with the utmost caution and often prove very exhausting to the subject. After all, it must be remembered that probably under certain conditions materialization cannot take place, whilst under favourable conditions it can be completely effected. For an exhaustive and authoritative discussion of the whole matter the Baron Von Schrenck-Notzing’s _Phenomena of Materialization_ (Kegan Paul, 1923), should be consulted. The 225 photographic reproductions are of the utmost importance, whilst the investigations were carried on under conditions of such pitiless severity to eliminate any hypothesis of fraud that the mediums cannot but have been subjected to the intensest physical and moral strain.