DEAR SIR--I write to ask what you consider the best book or pamphlet to put into the hands of people generally, in regard to the preservation of health. I know ther e are a number of very excellent publications, but as a rule they deal with certain details or phases of the question, and do not begin with the great underlying principles in such a wayas to attract and hold the attention of the masses. One advocates one plan, and another an entirely different, and sometimes a directly opposite plan--such as uncooked vs. thoroughly cooked food; a strictly vegetarian diet, and mental culture in place ofattention to either, etc. Such a state of affairs makes it confusing to average people and gets them to believe that health reformers are all at sea, and what is good for one is not good for another, or, in common language, "what is one man's meat is another's poison." Now, I know it is natural, and doubtless best, that there should be a difference of opinion on any question, but at the same time, if any movement is to be crowned with great success, there should be some underlying principles upon which allshould agree, and these should be pressed to the forefront, so as to attract and hold the attention of the people, in place of the divergent details upon which they disagree. If these fundamental laws and principles are thoroughly studied and well defined,it may be found that they would explain the discrepancies between the different theories, and that under certain conditions, one plan is best, and that under different conditions another plan is more applicable, etc. The pushing of these fundamental principles to the front would also tend to correct errors into which the different theorists have fallen, and would certainly tend to make the different theories more homogeneous and more easily understood by people in general, than at present. In my opinion, the general fundamental principles of life and health are what people need to understand more than anything else. Without this, most of the details will be meaningless or at least confusing dogmas. I don't mean by these fundamental principles the details of anatomy, or, for that matter, the details of anything else, but the general rules governing life and death, so that people may know which way they, are tending, and may understand the many illusions with which life and death, as well as all else in natureare beset.