422 Our Surroundings 



Movement of the Lymph. The movement of the lymph is 

 slower and not so steady as the movement of the blood. The 

 lymphatic system contains small sponge-like bodies called lymph 

 glands placed somewhat irregularly in its course. These aid in 

 eliminating material that is harmful to the body, and in destroying 

 disease germs. Physicians sometimes force medicine by means 

 of a syringe into the lymph that reaches the cells of the body. 

 This quickly enters the circulation through the capillaries and 

 becomes effective at once. 



Hygiene of Circulation. The cells of all parts of the body 

 depend upon the circulatory system to deliver their food and 

 oxygen and to remove their waste products. It is therefore clear 

 that good circulation promotes good health, and it becomes our 

 interest both to guard and to stimulate the circulation in every 

 possible way. 



Effects of Good Circulation. A well-nourished body has the 

 effect on the mind of producing abundant energy, alert thinking 

 and light spirits; and on the body, of causing good muscular con- 

 trol, bright eyes and glowing color. Good circulation is one main 

 reason for the charm of many people who possess attractive per- 

 sonalities. Good circulation cannot be kept up when other func- 

 tions of the body are neglected. The law of co-operation of all 

 parts of the body prevents that. All that promotes the general 

 health promotes good circulation, and good circulation promotes 

 the general health. 



Effect of Exercise. Action of the muscles increases the rate 

 of circulation. A certain amount of daily physical exercise is 

 necessary to prevent the blood from flowing sluggishly. Too slow 

 a rate reduces the number of circuits about the body and, as the 

 blood is reinforced with oxygen during each circuit, it reduces the 

 supply of oxygen to the cells of the body, and retards the removal 

 of wastes. Too little exercise makes people dull and listless. 

 About four miles of walking in outdoor air daily is good, but 

 some people are not strong enough for this, and should not overtax 

 themselves in the effort. Housework in ventilated rooms is one 

 substitute for walking. Fresh air during the taking of exercise 

 is essential, for the blood must have oxygen. 



