dispositions; none of them are ever subject to the destructive operation of such habits as are common among men. And the contrast is all the more remarkable when we consider that the very worst of these habits affect conditions of life which the lower animals share with us, and in which any departure from those natural laws which they universally obey, must necessarily produce, and do actually produce, consequences so destructive as to endanger the very existence of the race. Such are all those conditions of life affecting the relation of the sexes which are common to all creatures, and in which man alone exhibits the widest and most hopeless divergence from the order of Nature.” CHAPTER XIX. CONCLUSION. While the more important material agencies and conditions, closely related to the processes of life, are air, food, clothing, etc.; and while the reader’s attention has been, throughout, mainly directed to these; it would, from the author’s point of view, constitute a serious defect of the work, to omit the special consideration of the moral nature——its mighty influence over the physical state. In no better way can I impress this thought than by quoting the language of that veteran hygienist and reformer, Dr. James C. Jackson: “But while a human being has a physical organization, and has, therefore, physical laws, he is dual, possessing also a spiritual nature; and to treat him for any disease he may have as though it originated in his body and did not relate itself at all to his soul or spirit, is to treat him, in ninety-nine cases in a hundred, unphilosophically and therefore unscientifically. Our observation and experience go to satisfy us that the majority of sick persons become disturbed and disordered in spirit before they show disorder or derangement of body.