374 AGRICULTURE ON THE PACIFIC SLOPE 



If we go right on with our exercise, this stiffness soon 

 stops, because the body learns to remove the waste 

 substances faster. This has a very good effect on the 

 health of the whole body. Both heart and lungs help 

 in this; the heart beats faster, sending more blood to 

 the muscles and all over the body. We breathe faster 

 and deeper, thus purifying the blood better. 



At the same time the skin and kidneys begin to work 

 harder in getting rid of waste substances. The more we 

 exercise, the more we perspire. The perspiration of the 

 skin is full of waste substances, and it not only takes 

 them out of the body, but greatly cools the body by 

 evaporation. The kidneys (whose appearance is familiar 

 to all) are found in the back of the abdomen; they take 

 waste substances out of the blood and discharge them 

 as urine. If their purifying work stops, death occurs 

 in a short time. 



After vigorous exercise a cold shower-bath and rub 

 are in order. This has several good effects. 



First, the rubbing takes away the perspiration with 

 its poisonous substances, cleans out the sweat pores, 

 and puts them in good condition. 



Second, it cools the body. 



Third, it has a very soothing and pleasant effect on 

 the nerves. 



Fourth, it has a marked effect on the arteries under 

 the skin. The tiny muscles which surround these ar- 

 teries contract when chilled by the cold water, thus 



