WITH RESPECT TO HEALTH AND DISEASE. 283 



t is mucn more important that they should be properly 

 exercised than when no such predisposition exists. 



908. The lungs may be exercised indirectly by such 

 kinds of bodily, or muscular action, as is usual, as walk- 

 ing, running, riding, jumping the rope, &c., and directly 

 by the employment of the voice in reading, speaking, 

 singing, or playing on any wind instrument. 



909. In general, both should be conjoined, or used al- 

 ternately, as convenience permits. Where the chief ob- 

 ject is to improve the lungs, the kinds of exercise to be 

 employed should be such as tend to expand the chest, as 

 well as to give a free use of the lungs ; and among these 

 are rowing a boat, fencing, playing ball, quoits, and other 

 gymnastic exercised, where the arms are brought into 

 violent action. 



910. Where, either from hereditary predisposition, or 

 otherwise, the chest and lungs do not appear to have 

 common strength and development, every effort should 

 be made from infancy to favor their growth and strength 

 by using any or all of the above-mentioned exercises, as 

 occasion offers. 



911. Where no active pulmonary disease exists, action 

 of the above kind may be carried so far as to induce free 

 perspiration, taking care always to prevent taking cold, 

 by a change of dress, or in cool weather, going into a 

 warm room, when the exercise is over. 



