"Nature works with exceeding simplicity," he replied; "there is no complex apparatus in her laboratory, and I copy after nature." Then he dissolved the salt in a portion of water that he drew from the hydrant into my wash bowl, making a strong brine, and stirred sand into the brine to make a thick mush. This mixture of sand and brine he then poured into the cylinder, filling it nearly to the top. (See Figure 23, B. The sand settling soon left a layer of brine above it, as shown by A.) I had previously noticed that the upper end of the glass tube was curved, and my surprise can be imagined when I saw that at once water began to flow through the tube, dropping quite rapidly into the cylinder. The lower end of the curve of the glass tube was fully half an inch above the surface of the liquid in the cylinder. I here present a figure of the apparatus. (Figure 23.) The strange man, or man image, I do not know which, sat before me, and in silence we watched the steady flow of water, water rising above its surface and flowing into the reservoir from which it was being continually derived. "Do you give up?" he asked. "Let me think," I said. "As you please," he replied. "How long will this continue?" I inquired. "Until strong salt water flows from the tube." Then the old man continued: "I would suggest that after I depart you repeat these experiments. The observations of those interested in science must be repeated time and again by separate individuals. It is not sufficient that one person should observe a phenomenon; repeated experiments are necessary in order to overcome error of manipulation, and to convince others of their correctness. Not only yourself, but many others, after this manuscript appears, should go through with similar investigations, varied in detail as mind expansion may suggest. This experiment is but the germ of a thought which will be enlarged upon by many minds under other conditions. An event meteorological may occur in the experience of one observer, and never repeat itself. This is possible. The results of such experiments as you are observing, however, must be followed by similar results in the hands of others, and in behalf of science it is necessary that others should be able to verify your experience. In the time to come it will be necessary to support your statements in order to demonstrate that your perceptive faculties are now in a normal condition. Are you sure that your conceptions of these results are justified by normal perception? May you not be in an exalted state of mind that hinders clear perception, and compels you to imagine and accept as fact that which does not exist? Do you see what you think you see? After I am gone, and the influences that my person and mind exert on your own mind have been removed, will these results, as shown by my experiments, follow similar experimental conditions? In the years that are to pass before this paper is to be made public, it will be your duty