[10] Accounts of other experiments of the same type will be found in my book, "The Riddle of Personality," pp. 140-142. To mention only the most notable experiments of this systematic kind, I would call attention to the results obtained by two sets of English investigators, the first comprising two ladies named Clarissa Miles and Hermione Ramsden, the second two gentlemen, F. R. Burt and F. L. Usher. As I see it, indeed, the Miles-Ramsden and Burt-Usher experiments have the additional interest that they not only make clear some of the fundamental laws of genuine thought transference, but also show just why it is that we can never hope to obtain such absolute control of the telepathic process as to be able to send mental messages from one to another with the same ease and certainty as we now send ordinary telegrams and marconigrams. This inability of control has long been a stock objection against belief in telepathy, especially among the scientifically trained. "Not until we can repeat at will, and with invariable success, the experiment of direct transference of thought, will we accept telepathy as established," say these scientific skeptics. "We know that if, in our chemical and physical laboratories, we bring such and such elements together, such and such action will always follow. We must be able to do as much with telepathy before we will accept it." But the Miles-Ramsden and Burt-Usher experiments show that there are excellent reasons for affirming that telepathy is a fact, and that nevertheless its processes cannot be governed with the certitude possible in the case of chemical and physical processes. There are factors involved which elude, and must always elude, the directive control of the experimenter. In the experiments by the Misses Miles and Ramsden it was arranged that, at a stated hour of a stated evening in each week, Miss Ramsden--who acted throughout as the percipient, or receiver of the telepathic messages--was to remain for a few minutes in a condition of complete passivity, and immediately afterwards was to note on a post-card whatever ideas came into her mind during that time. The post-card was then to be mailed to Miss Miles, who, for her part, was to think of Miss Ramsden at intervals during the day agreed on, and in the evening was to make a post-card entry--to be mailed to her friend forthwith--of the idea or ideas she had tried to convey to her telepathically. Thus, in the event of achieving any degree of success, they would have a perfect documentary record to substantiate their claims.