AMERICAN SCHOOkOF HOME ECONOMICS 

 CHICAGO 



January 1, 1907. 

 My dear Madams 



In beginning our work in Household 

 Bacteriology together I should like to make a few 

 suggestions as to aims and methods of study. 



The aims to be reached in the study of any 

 science are at leaat two a knowledge of its un- 

 derlying principles and as thorough an application 

 of those principles as is possible. 



For the principles you will consult the lesson 

 booklets. From them, too, you will gat suggested 

 applications, but the subject will not become a. 

 part of yourself until you recognize new applica- 

 tions nany times a day. It is said that no person 

 KNOWS a foreign language until he can think in 

 that language. In a similar way you will want to 

 think these facts into your life and work. 



Suggestions for study have already been given 

 to you. I hope that you nay be able to try all of 

 the experiments suggested; at least make a "dust 

 garden" as described. If you can get no suitable 

 dish, a regular Petri dish may be obtained through 

 the School for 30 cents and a tube of prepared 

 "nutrient gelatine ".for 20 cents. The dish may 

 be returned. Also, I hope that you will read some 

 of the books recommended in the bibliography. 



The facts of bacteriology underlie so firmly 

 all our daily living that there is no need to go 

 far afield for illustrations. But a thorough 

 knowledge of the science can be gained only through 

 laboratory methods and with a microscope . There- 

 fore , I hope you may be able sometime to supple- 



