pricking, burning, or by a current from an induction coil. In the majority of the successful trials the insensibility was shown to be proof against all assaults, however severe. In these earlier experiments it seemed essential to success that Mr. Smith's hand should be in close proximity to that of the subject, without any intervening barrier. These conditions made it difficult to exclude the possibility of the subject learning by variations in temperature, or by air currents, which finger was actually being operated on; though it is hard to conceive that the percipient could by any such means have discriminated between Mr. Gurney's hand and Mr. Smith's. On the other hand, even if this source of error was held to be excluded, the interpretation of the results remained ambiguous. As a matter of fact, Mr. Gurney himself was inclined to attribute the effects produced, not to telepathy, as ordinarily understood, but to a specific vital effluence, or, as he phrased it, a kind of nervous induction, operating directly on the affected part of the percipient's organism. (_Proc. S.P.R._, vol. v. pp. 254-259.) With a view to test this hypothesis further experiments of the same kind were made by Mrs. Sidgwick during the years 1890 and 1892, the subjects being P. and Miss B. already mentioned. The percipient was throughout in a normal condition. As before, he sat at a table with his hands passed through holes in a large screen, which extended sufficiently far in all directions to prevent him from seeing either the operator or his own hands. Mr. Smith, as before, willed to produce the desired effect in the finger which had been intimated to him, either by signs or writing, by one of the experimenters. Passing over the trials, very generally successful, made under the same conditions as Mr. Gurney's experiments--_i.e._, with the agent's hand held at a short distance without any intervening screen from the finger selected--we will quote Mrs. Sidgwick's account of the later series performed under varied conditions. (_Proc. S.P.R._, vol. viii. pp. 577-596.) No. 28.--By MRS. H. SIDGWICK.