xviii CONTENTS. 



PAGE 



§ 16. Suspended Particles in Air and Water ; their relation to 



Bactena 75 



§ 17. Recent Experiments on Heterogenesis .... 84 



§ 18. Experiments with Filtered Air 85 



§ 19. Experiments with Calcined Air 88 



§ 20. Infusions withdrawn from Air . . . . . 90 

 § 21. The Germ Theory of Contagious Disease ... 91 

 § 22. Experiments with Hermetically-sealed Vessels . . . 94 

 § 23. Conditions as to the Temperature and Strength of In- 

 fusions 98 



§ 24. Developmental Power of Infusions and Solutions : Air- 

 germs contrasted with Water-germs . . . . 101 



§ 25. Diffusion of Germs in the Air 107 



§ 26. Tray of one hundred Tubes . 110 



§ 27. Some Experiments of Pasteur and their Relation to Bac- 

 terial Clouds 121 



Note I. Action of Bacteria upon a Beam of Light . 127 



Note II. Fluorescence of Infusions 128 



y 



FURTHER RESEARCHES ON THE DEPORTMENT 

 AND VITALITY OF PUTREFACTIVE OR- 

 GANISMS. 



Introduction 



Experiments of Pasteur, Roberts and Cohn 

 Hay-Infusions. Preliminary Experiments with Pipette 



bulbs 



Hay-Infusions. Experiments with Cohn's Tubes . 

 Hay-Infusions (in Closed Chambers) .... 

 Desiccation of Germs. New Hay and old 

 Hay-Infusions. Further Experiments with Closed 



Chambers 



Experiments with Soaked Hay 



Infusions of Fungi ....... 



Infusions of Cucumber, Beetroot, &c 



New Experiments on Animal Infusions. Contradictor^' 



results . 



Infusions protected by Glass Shades containing Calcined 



Air 



§ 16. 



Further Precautions against Infection . 

 Experiments in the Royal Gardens, Kew . 

 Experiments on the Roof of the Royal Institution . 

 Preliminary Experiments on the Resistance-limit 

 Germs to the temperature of Boiling Water 



of 



131 

 135 



138 

 144 

 146 

 148 



150 

 154 

 158 

 161 



165 



169 

 171 

 174 

 177 



180 



