TABLE or CONTENTS. 



Pa<,c 

 I. INTRODUCTORY— The Ideal Invisible World . 1 



Milton — Byron — Bulwer — Locke. 



II. The Invisible World revealed by the Microscope . 7 

 How to see— Captain Basil Hall— A group of Animalcules 

 — First glimpse of the In\risible World — Life in a di- 

 versity of forms. 



III. The Hydra, or Fresh-water Polype . . . .12 



Appearance of the Hydra— The Green Polype— The Com- 

 mon Polype— The Long-armed Polype— Polypes catch- 

 ing live prey — Tentacula of the Polype. 



IV. The Divisibility of Vitality 18 



Polypes cut to pieces — Each piece becomes a perfect 

 Animal— M. Trembley. 



V. Cells the Essential Organs of Life . . . .22 

 The Polype a congeries of cells — Plants all cells — Perfect 

 plants consisting of one cell only — Animals formed of 

 cells — Animals consisting of one cell only — Analogy 

 not Identity — The First germ of Disease in the cells 

 — Practical suggestions — Inhalation in Consumption. 



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