CHAPTER III.
ON THE SELECTION OF CASES FOR TREATMENT.
The remarks of the last chapter have, of course, wide and general application in disease, and naturally lead up to what I have to say as to the employment of the systematic treatment to describe which is my chief desire.

Its use, as a whole, is limited to certain groups of cases.

In some of the worst of them nothing else has succeeded hitherto, or at least as frequently.

In others the need for its application must depend on convenience and the fact that all other and readier means have failed.

It is, of course, difficult to state now all the groups of diseases in which it may be of value, for already physicians have begun to find it serviceable in some to which I had not thought of applying it,[11] and its sphere of usefulness is therefore likely to extend beyond the limits originally set by me.