Longcope [Footnote: Longcope, W. T.: The Effect of Repeated Injections of Foreign Protein on the Heart Muscle, Arch. Int. Med., June, 1915, p. 1079.] has recently shown that repeated, and even at times one protein poisoning can cause degeneration of the heart muscle in rabbits. Hence it is quite possible that repeated absorption of protein poisons from the intestines may injure the heart muscle as well as the kidney structure; consequently, in heart weakness, besides removing all evident sources of infection, we should also give such food and cause such intestinal activity as to preclude the absorption of protein poison from the bowels. CLASSIFICATION OF CARDIAC DISTURBANCES For the sake of discussing the therapy of cardiac disturbances in a logical sequence, they may be classified as follows: Pericarditis Acute Adherent Myocarditis Acute Chronic Fatty Endocarditis Acute, simple malignant Chronic Valvular Lesions Broken compensation Cardiac drugs Diet Resort treatment Cardiac disease in children Cardiac disease in pregnancy Coronary sclerosis Angina pectoris Pseudo-angina Stokes-Adams disease Arterial hypertension Cardiovascular-renal disease Arrhythmia Auricular fibrillation Bradycardia Paroxysmal tachycardia Hyperthyroidism Toxic disturbances Physiologic hypertrophies Simple dilatation Shock Stomach dilatation Anesthesia in heart disease BLOOD PRESSURE The study of the blood pressure has become a subject of great importance in the practice of medicine and surgery. No condition can be properly treated, no operation should be performed, and no prognosis is of value without a proper consideration of the sufficiency of the circulation, and the condition of the circulation cannot be properly estimated without an accurate estimate of the systolic and diastolic blood pressure. However perfectly the heart may act, it cannot properly circulate the blood without a normal tone of the blood vessels, both arteries and veins. Abnormal vasodilatation seriously interferes with the normal circulation, and causes venous congestion, abnormal increase in venous blood pressure, and the consequent danger of shock and death. Increased arterial tone or tonicity necessitates greater cardiac effort, to overcome the resistance, and hypertrophy of the heart must follow. This hypertrophy always occurs if the peripheral resistance is not suddenly too great or too rapidly acquired. In other words, if the peripheral resistance gradually increases, the left ventricle hypertrophies, and remains for a long time sufficient. If, from disease or disturbance in the lungs, the resistance in the pulmonary circulation is increased, the right ventricle hypertrophies to overcome it, and the circulation is sufficient as long as this ventricle is able to do the work. If either this pulmonary increased pressure or the systemic increased pressure persists or becomes too