TABLE OF CONTENTS. Xlll 



Page 

 XII . The Stephanoceros, or Crowned Wheel-animalcule . . 63 

 The appearance of the Stephanoceros — its ciliated tentacula 

 — its transparent, flexible, tubular case — The Stephano- 

 ceros Ehrenbergi — development of the young in the 

 Stephanoceros — Embryo in the egg — Liberation of the 

 young from the Egg, and from the sheath of the parent 

 — Various stages of growth. 



XIII. The Rotifer, or Wheel-animalcule 71 



The Rotifer vulgaris— its internal structure— the Wheels, or 

 rotatory organs— the Eggs — rate of increase — its dis- 

 tribution — its resuscitation. 



XIV. Animalcules with durable cases, or shells . . . .79 



The Brachionus, or Spine-bearing Animalcule — The Pitcher- 

 shaped Brachionus — its jaws and teeth — Baker's Bra- 

 chionus — Strata composed of cases of Infusoria. 



XV. Reflections . . . . 82 



XVI. General Remarks — Conclusion . . . . '85 

 The Infusoria — Influence of Temperature— Animalcules in 

 vegetable infusions — The ova and germs of Animal- 

 cules every where — Animal structures almost fluid — 

 The Medusae — The Power of Vitality — Fiual purposes 

 — Animalcular origin of many Epidemic diseases — 

 The moral Influence of natural knowledge. 



Appendix 95 



Miscellaneous Notes . . " 109 



Description of the Plates 113 



Index . . . . . .139 



