ment this study by microscopic work. Perhaps 

 through the aid or some doctor or other scientist 

 you may be able now to get a peep into this world 

 of the unseen. 



If these les'sons point out dangers of which 

 you were before unconscious, they also suggest 

 ways of escape from those dangers. You will gain 

 some knowledge of the causes of waste and disease 

 If this leads you to efforts for the prevention 

 and removal of such causes, the result will be 

 those healthful conditions which make the most 

 effectual safeguard against the attacks of the 

 few micro-organisms that are our foes. 



I hope the relations between hygiene and some 

 of the daily tasks of housekeeping will gain a 

 deeper significance in your mind: and this ele- 

 mentary study may result not only in pleasure and 

 profit to you, but also, through you, in better 

 conditions of healthful living for others. 



Sincerely yours. 



Instructor 



