"Watch, my friend. Watch and take notes. And if I go back too far you must recall me to reality. You can recall me by shaking me violently. If I appear to be suffering acute physical pain you must recall me at once." "Chalmers," I said, "I wish you wouldn't make this experiment. You are taking dreadful risks. I don't believe that there is any fourth dimension and I emphatically do not believe in Tao. And I don't approve of your experimenting with unknown drugs." "I know the properties of this drug," he replied. "I know precisely how it affects the human animal and I know its dangers. The risk does not reside in the drug itself. My only fear is that I may become lost in time. You see, I shall assist the drug. Before I swallow this pellet I shall give my undivided attention to the geometric and algebraic symbols that I have traced on this paper." He raised the mathematical chart that rested on his knee. "I shall prepare my mind for an excursion into time. I shall _approach_ the fourth dimension with my conscious mind before I take the drug which will enable me to exercise occult powers of perception. Before I enter the dream world of the Eastern mystics I shall acquire all of the mathematical help that modern science can offer. This mathematical knowledge, this conscious approach to an actual apprehension of the fourth dimension of time will supplement the work of the drug. The drug will open up stupendous new vistas--the mathematical preparation will enable me to grasp them intellectually. I have often grasped the fourth dimension in dreams, emotionally, intuitively, but I have never been able to recall, in waking life, the occult splendors that were momentarily revealed to me. "But with your aid, I believe that I can recall them. You will take down everything that I say while I am under the influence of the drug. No matter how strange or incoherent my speech may become you will omit nothing. When I awake I may be able to supply the key to whatever is mysterious or incredible. I am not sure that I shall succeed, but if I _do_ succeed"--his eyes were strangely luminous--"_time will exist for me no longer!_" He sat down abruptly. "I shall make the experiment at once. Please stand over there by the window and watch. Have you a fountain pen?" I nodded gloomily and removed a pale green Waterman from my upper vest pocket. "And a pad, Frank?" I groaned and produced a memorandum book. "I emphatically disapprove of this experiment," I muttered. "You're taking a frightful risk." "Don't be an asinine old woman!" he admonished. "Nothing that you can say will induce me to stop now. I entreat you to remain silent while I study these charts." He raised the charts and studied them intently. I watched the clock on the mantel as it ticked out the seconds, and a curious dread clutched at my heart so that I choked. Suddenly the clock stopped ticking, and exactly at that moment Chalmers swallowed the drug. * * * * *