OUR BODIES AND HOW WE LIVE 



gives forth waste material. When the amoeba grows to 

 a certain size it divides into two parts, each of which 



becomes an amoeba in itself. In 

 every drop of our blood certain 

 cells, the white blood corpuscles, 

 may be found, even smaller than 

 the amoeba and not unlike it in 

 structure. 



15. The Nature of Protoplasm. 

 Besides proteid, and usually a small 

 amount of carbohydrates and fat, 

 protoplasm contains much water in 

 which are dissolved small quanti- 

 ties of mineral substances. Our 

 bodies, as we have just learned, are 

 made up of exactly these same sub- 

 stances, proteids, carbohydrates, 

 fats, water, and mineral salts. They 

 are contained in the protoplasm, or 

 living matter. 



Finally, we must remember that 

 to manifest life, protoplasm, the 

 essential material of all living things, 

 whether plants or animals, must 

 come in contact with oxygen and 

 water and must be warmed to a 

 certain temperature. 



16. How Energy is set Free by 

 Protoplasm. Coal, as we know, is 



the hardened vegetable deposit of forests that lived and 

 died in past ages. If we set fire to coal, its energy is set 

 free or awakened from its long rest like the sleeping princess 



FIG. 2. Diagram showing an 

 Amoeba in Successive 

 Stages of Division. 



The dark spot is the nucleus. 

 The light and somewhat 

 rounded clear spots are more 

 or less sharply denned cavities 

 filled with fluid, and are known 

 as vacuoles. 



