HEART TROUBLE gas, a cause of, II 448-572 early symptoms of, II 570 medical misconceptions of, II 570 causes of, II 571 diet for, II 573 exercise for, II 574 HEAT production of, I 41 body determination of, I 42 a measure of energy, I 198 units, I 199 HEMOGLOBIN component parts of, I 130 HEMORRHOIDS (see Piles), II 471 HEREDITY, V 1293 so-called wonders of microscopic study of reproductive cells in, V 1294 chromosoms in different species, V 1294 action of, V 1294 what it is, V 1295 characteristics not due to, V 1296 summary of facts regarding sex and, V 1297 HERNIA causes of, II 443 HONEY food value of, II 330 composition of, II 331 HUMAN ILLS chiefly due to dis-eases and conditions originating in the stomach, I 4 (see chart showing dis-eases caused by superacidity), I 9 HYDROCARBONS definition of, I 89 uses of, I 89 where found, I 89 how formed, I 90 HYDROCHLORIC ACID how formed, I 64 action of, I 65 its importance in digestion, I 66 chemical symbols of, I 67 HYDROGEN where found, I 42 physical properties, I 43 chemical properties of, I 43 gas, I 45 I