I trust you do not conclude that the description which I have just given you of the clinical characters of these various disorders and diseases of the heart is in any sense complete. It only relates to the most prominent symptoms and signs as they present themselves to us in what might be called the every-day life of the patient, at a period in the history of his case precedent to failure. In all of them there may occur occasional attacks of acute embarrassment of the heart and lungs from one or more of a variety of causes, such as indigestion, excitement or over-exertion. Sooner or later, also, there occurs either cardiac dropsy--insidiously developed after increasing local distress, growing dyspnœa and "bad nights"; or Bright's disease; or cerebral thrombosis or hæmorrhage, or acute myocardial failure with angina: or the patient dies from failure of the heart in the course of some acute disease such as bronchitis or pneumonia. Neither have I considered it necessary in this lecture to dwell on some of the rarer phenomena occasionally met with, such as tachycardia and bradycardia. I may have occasion to refer to them next time in connection with prognosis. LECTURE III. MR. VICE-PRESIDENT AND GENTLEMEN,--In this, the concluding lecture of the series, I will attempt to deal with the applications of the facts and considerations which I submitted to you on the two previous occasions when I had the honour to address you. I trust that what I then laid before you proved to be of some interest. Let us see now whether it is practically useful. However much the etiology and pathology of the diseases and disorders of the heart and arteries in middle and advanced life may deserve study as matters of natural history, we should be disappointed if they could not be turned to account in prognosis and treatment. These are the subjects I propose to discuss this evening.