Flight Through Tomorrow by Stanton A. Coblentz

Nothing was further from my mind, when I discovered the "Release Drug" Relin, than the realization that it would lead me through as strange and ghastly and revealing a series of adventures as any man has ever experienced. I encountered it, in a way, as a mere by-product of my experiments; I am a chemist by profession, and as one of the staff of the Morganstern Foundation have access to some of the best equipped laboratories in America. The startling new invention—I must call it that, though I did not create it deliberately—came to me in the course of my investigations into the obscure depths of the human personality.

It has long been my theory that there is in man a psychic entity which can exist for at least brief periods apart from the body, and have perceptions which are not those of the physical senses. In accordance with these views, I had been developing various drugs, compounded of morphine and adrenalin, whose object was to shock the psychic entity loose for limited periods and so to widen the range and powers of the personality. I shall not go into the details of my researches, nor tell by what accident I succeeded better than I had hoped; the all-important fact—a fact so overwhelming that I shudder and gasp and marvel even as I tell of it—is that I did obtain a minute quantity of a drug which, by putting the body virtually in a state of suspended animation, could release the mind to travel almost at will across time and space.