CONTENTS 
Letter to Students , . , , . v 
Dust i 
Dust-Gardens . . . « . , 7 
Dust Plants . . . , . . 15 
Bacteria . . . , ,16 
Molds ....... 33 
Yeasts . ....... 3 g 
Work of Bacteria ..... 47 
Butter Making ...... 57 
Cheese ....... 58 
Vinegar ....... 60 
Harmful Dust Plants ..... 63 
Preserving Food . . . . . .69 
Disease Germs ...... 75 
Resistance of the Body . . . . .86 
Sanitation . . . . . . 96 
History of Bacteriology . . . .109 
Summary . . . . . . .113 
Extracts from the Instructor’s Note Book . 117 
Safeguards of the Body Against Disease, by 
T. Mitchell Prudden . . . .127 
Bibliography . . . . . 153 
Supplemental Study Outlines . . . .157 
Index ....... i 63 
