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Dec. 23, I876.] THE BRITISH MEDICAL 7OURNAL. 817 distinct-one produced by the left, the other by the right ventricle. Well recognised differences in character between them are recognised. How does Dr. Leared explain these, if the sounds be the product of collision of the blood, and not of tension of the ventricular walls and valves ? 4. The first sound undergoes remarkable modifications-(a) in dilatation of the ventricles; still more (b) in stenosis of the mitral orifice. It is not weaker, anddoi:10.1136/bmj.2.834.817 fatcat:udihaxjoszbk5p3preh44mxxme