ttYGtENS. 3 



4. What Hygiene is. Lastly, when you had learned 

 something of how the watch was made and what each part 

 of it had to do, you would know that certain things must 

 injure it; that it should be kept dry lest the steel springs 

 rust, and that the case must be kept closed to prevent 

 dust and grit from getting into the works. You might 

 also be told some things which it would take you a 

 longer time to find out for yourself; as, for example, that 

 if the watch is to be a good time-keeper it must be regu- 

 larly wound up, and not at one time one day and at 

 another the next, or perhaps quite forgotten a third. 



So, without learning much Anatomy and Physiology 

 you will readily see that certain things must be bad 

 for your body: such as getting wounds that will cause 

 great loss of blood, or going without food. The harm- 

 fulness of other things it might take you a long time to 

 find out by yourself; as, for example, that by breathing 

 foul air or taking too little sleep, eating imprudently or 

 drinking what is called "spirits," you might very easily 

 injure your body beyond cure. Unless you were warned 

 you would probably not discover the danger until too 

 late to avert it. 



Just as a watchmaker could save you a great deal of 

 time and risk by giving the results of his experience as 

 to the best way to manage a watch, physicians and others 

 who have made a study of what is good and what bad 

 for the human body can save us much labor and danger 

 by telling what they have found out. The science which 



4. Having examined a watch, what would at once occur to you about 

 its preservation ? What studies teach you that certain things would 

 be bad for your body? Name some injurious habits that the ex- 

 perience of others warns you to avoid. What is meant by Hygiene? 



