If the operator, having put a subject to sleep (which he can do in most cases, if he be clever, and the experiments are renewed often enough), will say or suggest to him that on the next day, or the one following, or, in fact, any determined time, he shall visit a certain friend, or dance a jig, or wear a given suit of clothes, or the like, he will, when the hypnotic sleep is over, have forgotten all about it.

But when the hour indicated for his call or dance, or change of garment arrives, he will be haunted by such an irresistible feeling that he _must_ do it; that in most cases it will infallibly be done.

It is no exaggeration to say that this has been experimented on, tested and tried thousands of times with success and incredible ingenuity in all kinds of forms and devices.

It would seem as if spontaneous attention went to sleep, but, like an alarm clock, awoke at the fixed hour, and then _reflex_ action.
Again--and this constitutes the chief subject of all I here discuss-- we can _suggest_ to ourselves so as to produce the same results.

It seems to be a curious law of Nature that if we put an image or idea into our minds with the preconceived determination or intent that it shall recur or return at a certain time, or in a certain way, after sleeping, it will _do so_.