The appearance of Lights at Spiritualistic circles, apparently not due to any physical cause, is very widely asserted. The character of the Lights is as varied as it is possible to imagine. Faint, cloudy, indefinite luminous appearances--brilliant stars which move or hover among the sitters--globes or balls of light, like illuminated ostrich eggs, or spheres of mother-of-pearl lit up from within--pillars of light--are some of the many forms which this manifestation takes. But anything approaching to scientific evidence of the reality of the phenomenon is singularly scarce. And I am not aware that anything has ever been done towards testing or endeavouring to ascertain the nature of the light. One reason for this is, no doubt, that to investigate light phenomena, the exclusion of other light is obviously requisite. Hence the necessity for dark seances. The objection to a dark seance in itself can of course have no scientific basis. But a strong feeling against dark seances has arisen from the abuses to which they have led. It is possible that the extent of the evil has been exaggerated, and has thus produced an exaggerated prejudice against darkness as a condition. It is, however, safe to say, that, even if promiscuous seances are ever useful or wise, a promiscuous dark seance should never be sanctioned by an earnest inquirer. Orthodox science has not yet condescended to bestow any attention on "spirit lights." I had the privilege of private acquaintance with Dr. Tyndall, and once acted as his assistant at some lectures he gave in a country place. I remember sending him a report of some rather remarkable manifestations of light witnessed at a private seance in London, under fairly good test-conditions. Dr. Tyndall was at the time engaged in some special optical investigations, and I asked him to spend five minutes in reading the notes enclosed. Dr. Tyndall's reply, in his laconic, jocular style, was to this effect--"I have spent five minutes as you desired, and it is a long time since I spent five minutes so badly!" The best series of "light" phenomena, both as regards their varied character, and as regards the observers, and the care with which records at the time were made, occurred in the presence of Mr. W. Stainton Moses. A special chapter is devoted to his general experiences later on, but I will deal with the phenomena of lights here, and make this the only illustration of this branch of the subject. For the general credibility of the W. Stainton Moses phenomena the reader is referred to the opening paragraph of Chapter VI. The following pages are taken, by way of either extract or abstract, from two articles on Mr. W. Stainton Moses by Mr. F. W. H. Myers. They thus have the advantage of Mr. Myers' moral certificate, so to speak, as to their value. The articles were published in the _Proceedings_ of the Society for Psychical Research.[15]