“But, let me first finish the story of my experimental dose, for I took it again the third night, and underwent a very similar experience, delayed like the first in coming, and then carrying me off my feet when it did come with a rush of this false demon-laughter. This time, however, there was a reversal of the changed scale of space and time; it shortened instead of lengthened, so that I dressed and got downstairs in about twenty seconds, and the couple of hours I stayed and worked in the study passed literally like a period of ten minutes.”

“That is often true of an overdose,” interjected the doctor, “and you may go a mile in a few minutes, or a few yards in a quarter of an hour. It is quite incomprehensible to those who have never experienced it, and is a curious proof that time and space are merely forms of thought.”