320 



ANALYTICAL INDEX. 



CHAPTER XII.— continued. 



Zoophytes seldom of lively colour, 

 Their ova yellow, 



page 269 

 ib. 



III. Parts of zoophytes, 

 Root, 



Foundation cell, 



Admirable provisions of Nature, 

 Some zoophytes have scarcely a root, 

 Some are free, 

 Nourishment through the root ? 



ib. 

 270 

 271 



ib. 



ib. 



ib. 

 272 



IV. Stem, . . . . 



Pith, indispensable to life, 

 Not evident in foliaceous zoophytes, 

 Articulations of the stem, 

 Sometimes regular, 

 Genei'ally irregular and obscure, 

 An auxiliary to systematic arrangement, 

 Power over the stem, 

 Stem of aggregated tubuli, 

 Reproduction from the tubuli, 

 Arborescent forms without foliage, 



ib. 



ib. 



ib. 

 273 



ib. 



ib. 



ib. 



ib. 



ib. 

 274 



ib. 



V. Hydra, . 



Connected with the pith, 



Developed from it ? 



Nature of the pith, 



Essential to life and vigour, 



Elements of hydrse reside below, 



Varieties of the hydra few, 



Nature of the Hydra {polypus) most obvious, 



Tentacula, varieties of, . 



Number no positive distinction, 



Few originally, .... 



Coryna glandidosa, 



Animal functions obscure in zoophytes, 



Circulation in some, 



Food seldom obvious, 



Procured chiefly by the tentacula, 



Evolution of the tentacula, 



Parts of animals of use unknown, 



ib. 



ib. 



ib. 



ib. 

 275 



ib. 

 276 



ib. 

 277 



ib. 



ib. 

 278 



ib. 



ib. 



ib. 

 279 



ib. 



ib. 



