HOUSEHOLD BACTERIOLOGY 
M OST persons now know that mankind is greatly 
troubled by the work of certain minute agents 
—variously termed germs, bacteria, micro-organ- 
isms. Few, however, realize the good that these 
forms do, or understand them and their place in the 
. world. It is the purpose of the following pages to 
show the relations, both good and evil, that bacteria . 
and other micro-organisms bear to the household. 
DUST 
♦ 
Most housewives look upon dust as an undesirable Prevalence 
thing that they are constantly seeking to be rid of. If ° f Dust 
dust is seen on the piano or on the table each thinks 
she will be considered a slack housekeeper. Perhaps 
some are not troubled by the presence of dust that does 
not show. Such fight the enemy vigorously where vis- : 
ible, .but relax effort where or when he is invisible'. 
The temptation comes to hide the tell-tale dust by 
shutting out light. 
Few persons there are who have not at some time 
