CONTENTS. XIX 



PAGE 



§ 17. Further Experiments on the Resistance-limit of Germs 



to the Boiling Temperature 183 



§ 18. Change of Apparatus. New Experiments with Filtered 



Air 188 



§ 19. Final proof that the Resistant Germs are embraced by 

 the Infusion. Examples of Resistance both in Acid 



and Neutral Liquids . . . . . . . 194 



§ 20. Remarks on Acid, Neutral, and Alkaline Infusions . 203 



§ 21. Remarks on the Germs of Bacteria as distinguished 



from Bacteria themselves ...... 205 



§ 22. Sterilization by discontinuous Heating . . . . 210 



§ 23. Mortality of Germs through defect of Oxygen produced 



by Exhaustion with the Sprengel Pump . . . . 216 



§ 24. Mortality of Germs through defect of Oxygen conse- 

 quent on boiling the Infusion ...... 221 



§ 25. Critical Review of the last two Sections .... 225 



§ 26. Mortality of Germs through excess of Oxygen . . . 227 



§ 27. Experiments on neutralized Urine ..... 228 



§ 28. Hermetically-sealed Flasks exposed to the Sun of the 



Alps 231 



§ 29. Remarks on Hermetic Sealing 233 



§ 30. Experiments with Turnip-cheese Infusions . . . 234 



FERMENTATION, AND ITS BEARINGS ON 



SURGERY AND MEDICINE 237 



SPONTANEOUS GENERATION . . .277 



APPENDIX 321 



