Abstract
The total number of myocardial cells of the left ventricle of normal and hypertrophied hearts was histometrically evaluated in autopsy cases. In the postnatal life it was kept constant both in physiological and pathological growth of the heart. It was concluded that cardiac hypertrophy was induced by geometrically similar enlargement of individual myocardial cells. The role of amitoses of the myocardial nuclei in numerical increase of the heart muscle cells was rather doubtful.
