Table of Contents 



XI 



CHAPTER XII 



INSECTS AND HUMAN HEALTH . . . . . . 



A Typical Germ Disease Malaria, 523 ; The Mosquito, 535 



PAGE 



523 



CHAPTER XIII 



ICROORGANISMS IN RELATION TO MAN 546 



The Dust of the Atmosphere, 546 ; Molds, 549 ; Yeasts, 558 ; 

 Bacteria, 570. 



CHAPTER XIV 



HE PROTECTION OF HEALTH 588 



Infection and Immunity, 588 ; Modern Theories of Immunity, 

 599 ; Vaccines and Antitoxins, 604. 



