Notice to the Reader.

I do not pretend that it will not offer many difficulties; but it is necessary to know that these are of such a nature as to be smoothed away by no amount of reasoning without the assistance of experience original: "expérience"; in this context, it refers to practical experimentation and clinical observation: it alone will dispel the clouds, and place in its proper light this important truth: that NATURE OFFERS A UNIVERSAL MEANS OF HEALING AND PRESERVING MANKIND.