WHAT MAKES MAN GO 



63 



When man is sick of fever for some time, tliere 

 is a marked loss in weight due to the fact that first 

 the fat and later part of the muscle tissue has been 

 used to supply the abnormal amount of heat. In 



Nitrogen 



Sulphur 

 Phosphorus 

 Calcium 

 etc. 



Figure 17. Diagram to show the proportionate amounts of 

 chemical elements in living things. The human body is com- 

 posed of these elements in the following proportions: Oxygen, 

 72%; carbon, 13.5%; hydrogen, 9.1%; nitrogen, 2.5%; 

 calcium, 1.3%; phosphorous, 1.15%; sulphur, .147%; potassium, 

 .026% iron, .01%. 



repairing such a loss proteins are needed to make 

 good the wasting away. This use of proteins and 

 the service which carbohydrates and fats do in 

 furnishing heat and energy for the contracting 



