Democratic Sentinel, Volume 17, Number 44, Rensselaer, Jasper County, 17 November 1893 — All About the Human Heart. [ARTICLE]

All About the Human Heart.

The human heart is a hollow muscle ot a conicle form placed between the two lungs and inclosed in the pericardium, or heart sac. The ordinary size of the heart in the adult is about 5 inches in length, iH inches in breadth at the broadest part and2i inches in thickness, and its weight is 10 to 12 ounces in men and Bto 10 ounces in women. The increase in size is greatest and most rapid during the first and second years of life, its bulk at the end of the second year being exactly double what it originally was. Between the second and seventh years it is again almost double in size. A slower rate of growth then sets in and continues during the period of maturity of other portions of the body. After the fifteenth year up to the fiftieth the annual growth of the heart is about .061 of a cubic inch, the increase ceasiDg about the fiftieth year.—[Chicago Herald.