CONTENTS 



PAGE 



BACTERIOLOGY IN THE VICTORIAN ERA . . . i 



WHAT WE BREATHE , . . 34 



SUNSHINE AND LIFE . . . 65 



BACTERIOLOGY AND WATER . . 93 



MILK DANGERS AND REMEDIES . . . 118 



BACTERIA AND ICE . . ... 149 



SOME POISONS AND THEIR PREVENTION 168 



