MCCLINTOCK, DR. 21 MOORE, THOMAS, M.D. 10 NAGEL, RICHARD. M.D. 218 NICHOLS, JAMES R., M.D. 171 NICHOLS, T. L., M.D. 156, 205 OSWALD, FELIX L., M.D. 29, 45, 47, 49, 51, 70, 188 PARKER, PROF. WILLARD, M.D. 21 POPULAR SCIENCE MONTHLY 243 PITCHER, ————, M.D. 69 PRESCOTT, PROF. ALBERT B. 243 RICHARDSON, PROF. B. W., M.D. 171, 240 RUSH, ————, M.D. 133 SARGENT, PROF. DUDLEY A. (HARVARD) 261 SAVAGE, M. J. 156, 157 SCIENTIFIC AMERICAN 239 SCHLEMMER, DR. 212 SCHMIDT-MÜHLHEIM, PROF. 60 SHAPTER, LEWIS, M.D. 244 STEVENS, A. H., M.D. 21 THOMPSON, SIR HENRY 53, 54, 55, 56 VIREY, JULES, M.D. 202 WELCH, PROF. (YALE) 51 WOOD, PROF. CASEY A., M.D. 145 CHAPTER I. INTRODUCTION. Although it is evident to my mind that the world is growing more healthy and more moral with every generation——speaking of civilized nations——it is still, as all agree, in a most pitiful state as regards both moral and physical health. The two are indissolubly associated, notwithstanding the glaring exceptions which are, indeed, more apparent than real, and it is difficult to appreciate which leads——whether man grows more healthy as his moral tone improves or more moral as his physical state is exalted. Both are, in fact, constantly acting and reacting upon each other. Few people withdraw themselves from the influence of disease-producing habits, who do not first come to hate disease as a symptom of disobedience to the laws governing their organism. The pain of an aching head is not sufficient, generally, although it may discount the tortures of the damned, to determine the sufferer to live a better life; but when he comes to know the fact that the disorder is needless, brought upon himself by violation of law, and that it is the normal office of pain to warn of danger; then, if he be conscientious, instead of cursing his suffering, he will feel ashamed of his sin, and endeavor to learn the laws of life and obey them.