. Fig. 42. Diagram showing position of heart in chest, position of valves as projected on the wall of the chest, and the parts of the chest where the sounds of the heart are heard best. M, position of apex beat, and sound from mitral valve; T, sound from tricuspid valve; A, sound from aortic valve; P, sound from pulmonary valve. sentially of a receiving disk and a pair of ear-tubes, con- nected by tubing. It aids by multiplication of the sound and by excluding outside sounds. Distracting noises, to be

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Keywords: ., bookcentury1900, bookdecade1910, booksubjectphysiology, bookyear1