And I believe it may be fairly admitted that in this work I have simplified the process of physically influencing mental action and rendered it easier.

The result from the above conclusions being that _we can control many disorders or forms of disease_.

This is an immense subject, and it would be impossible within a brief sketch to determine its limits or conditions.

That what are called nervous disorders, which are evidently the most nearly allied to emotions--as, for instance, a headache, or other trouble induced by grief--can be removed by joy, or some counteracting emotion or mere faith is very well known and generally believed.

But of late science has established that the affinities between the cerebral and other functions are so intimately, extensively and strangely sympathetic or identical that it is becoming impossible to say what disease may not be temporarily alleviated or cured by new discoveries in directing the nervo-mental power or will.