When this theory I have here given you to-night is fully comprehended by the medical world and taught the public, together with the kind of foods necessary for every one in their respective occupation, location, and climate, we may expect a vast change in their physical condition and a hope for the future which will brighten as time advances. I herewith attach the sphygmographic tracings made upon myself by another, showing the state of the pulse as compared with the progress of the respiration. ADDENDA. Sphygmographic tracings of the pulse of the essayist. Normal pulse 60 to the minute. Ten seconds necessary for the slip to pass under the instrument. [Illustration] A, A¹, normal pulse. B, pulse taken after breathing rapidly for 15 seconds when 20 respirations had been taken. C, rapid breathing for 30 seconds, 43 respirations. D, " " 45 " 76 " E, " " 60 " 96 " F, pulse taken after rapid breathing for one minute, as in E, where no respiration had as yet been taken after the essayist had kept it up for that one minute. This was after 10 seconds had intervened. G, the same taken 50 seconds after, and still no respiration had been taken, the subject having no disposition to inhale, the blood having been over oxygenated. The pulse in E shows after 96 respirations but 14, or 84 per minute, and the force nearly as in the normal at A, A1. The record in B shows the force more markedly, but still normal in number. F and G show very marked diminution in the force, but the number of pulsations not over 72 per minute; G particularly so, the heart needing the stimulus of the oxygen for full power. The following incident which has but very recently been made known, gives most conclusive evidence of the truth of the theory and practice of rapid breathing. A Mexican went into the office of a dentist in one of the Mexican cities to have a tooth extracted by nitrous oxide gas.