(_b_) The relative position of the medium, and that of the screen intercepting her view of the disk, are too conspicuous to require particularization. FIG. 2, represents Pease’s disk, or dial apparatus, associated with a vibrating lever and stand contrived by myself. The whole, thus modified, has been named the Spiritoscope. (_c_) The apparatus thus designated consists of a box _F_, which is a miniature representation of a low, square, four sided house, with a single sloping roof, but without any floor closing it at the bottom. (_d_) On the outside of the part serving as the roof, the alphabetic dial is depicted. On the inner surface of the roof board, the spring, pulley, and strings are attached, by which the index is made to revolve, so as to point out any letter. (_e_) _G_ represents the vibrating lever upon which the medium’s hands are placed. When test conditions are not requisite, her hands should be situated so as that merely one-half may be on each side of the fulcrum wire, on which the lever turns. When test conditions are requisite, the hands should be altogether on the portion of the board which is between the exterior end of the board and the fulcrum. When thus placed, it is utterly impossible to move the lever so as to cause it to select letters, or to control the selection, by any spirit who may be employing them to make a communication.[1] (_f_) Not only are the letters of the alphabet printed equidistant, in due order, on the margin of the disk or dial-face; there are likewise words, the digits, and notes of music. (_g_) The words are as follows: _Yes_—_Doubtful_—_No_—_Don’t know_—_I think so_—_A mistake_—_I’ll spell it over_—_A message_—_Done_—_I’ll come again_—_Good-bye_—_I must leave_. These words are printed on equidistant radial lines, nearly dividing the area between them. The digits are printed on radial lines intermediate between those on which the words appear. Five concentric circular lines, dividing the margin into as many smaller portions, as in music paper, serve for the inditing of musical notes; respecting which the directions are given by Pease upon a printed slip of paper pasted inside.