ANALYTICAL INDEX. 



CHAPTER I.— HYDRAOID ZOOPHYTES, . . . page 1 



§ 1. TCBDLARIA InDIVISA, ..... 2 



Its head a hydra or polypus, with a double row of tentacula, 3 



Head regenerated, ...... 4 



Five heads regenerated successively, ... 6 



Growth of the stem results from the hydra, . . . ib. 



Regeneration originates low in the stem, ... 7 



Propagation, ....... ib. 



Ovarium situated on the head, .... ib. 



Matrix, a cluster of cysts, . . . . . ib. 



Embryo, or young discharged from the cyst, . . 8 



Endowed with locomotion, . . . . . ib. 



Animals originate from a vascular speck, ... 9 



Institution of life, . . . . . .10 



Animals originally transparent, .... ib. 



Ovular form transient, . . . . . ib. 



Zoophytes are of animal nature exclusively, . . 11 



Nascent moving tubularia becomes rooted, . . . ib. 



Head of Tubularia is deciduous, .... ib. 



Prognostics of its fall, . . . . .13 



The parent less protected than the progeny, ... ib. 



Embryo or young expelled before the head falls, . . ib. 



No second progeny generated in the cyst, . . . ib. 



Season of propagation, . . . . .14 



Fine ovarium in 1826, ..... ib. 



Egg a wonderful device of nature, . . . . ib. 



Creation of animated beings, . . . . 15 



Regeneration from below, . . . . . ib. 



The stem vegetates downwards at first, ... ib. 



Elements of organization in the head, . . . . ib. 



Six heads regenerated in six months, ... 17 



VOL. 1. 



2 K 



