TABL:E OF CONTENTS. 



Page 



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 Invisible 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 hi the cells 

 Practical suggestions Inhalation in Consumption. 



