4 
I 
Page. 
Bacteria in the air 53 
Bacteria in water 54 
Bacteria in soil 55 
Purification and disposal of sewage 56 
Milk 57 
Principles and practice of disinfection and sterilization 58 
Testing of antiseptics 59 
Testing germicides : 60 
Gaseous disinfection 61 
Insecticides 62 
The disinfection of houses, ships, and objects. (Disinfection and prophylaxis 
against the communicable diseases. ) 63 
Babies 64 
Vaccination 65 
Malaria and mosquitoes 66 
Insects as factors in transmitting disease 67 
Trypanosomes 68 
Filarial embryos 69 
Ferments 70 
Immunity 71 
Toxins 72 
Cytolysins and cytolysis 73 
Transportation of diseased tissues and bacteriologic specimens, etc., by mail 
and express 74 
Index 75 
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