CONTENTS. 



PART I. 



An Introductoky IIistoiiy of Infusorial Animalcules. 



PAcr. 

 Section 1 . Localities and appearance of Infusoria in masses , 7 



2. General external forms, coverings, organs and members of 



Infusoria 11 



3. On the eye specks, or visual organs of Infusoria 17 



4. Distinction between Infusoria and other minute Animals and 



Plants 18 



5. Effects of temperature on Infusoria 22 



6. Effects of Air, Chemical Mixtures, and Poisons, on Infusoria 23 



7. Effects of Electricity, Galvanism, and Magnetism, on Infusoria ... 25 



8. On the resuscitation of Infusoria 25 



9 . On the supposed method of manufactui'ing Infusoria 27 



10. On the evolution of light by Infusoria 28 



11. Classification of Infusoria into Polygastrica, Rotatoria, &c 29 



12. On the Polygastrica as a class ; and of their habitats and 



movements 31 



13. On the digestive system of the Polygastrica 34 



14. On the vascular and respiratory systems, and of the secretions 



of Polygastrica 44 



15. On Organs of Sensation in the Polygastrica 46 



16. Reproduction of Polygastrica 48 



17. Of the affinities and classification of Polygastrica 56 



18. Geographical disti'ibution of Polygastrica, their relative abxmd- 



ance, &c 62 



19. Of the Rotatoria as a class ; and of their habitats and movements 65 



20. Of the external coverings, muscular system, and organs of 



locomotion, of Rotatoria 68 



21. Of the digestive system of the Rotatoria 73 



22. Of the vascular and respiratory systems of the Rotatoria 77 



23. Of the organs of sensation and nervous system of Rotatoria. .... 81 



24. Of the reproductive organs, and the reproduction of Rotatoria... 82 



25. Of the affinities and classification of the Rotatoria 86 



26. On showers of Infusorial Animalcules.,. 89 



