258 



ANALYTICAL INDEX. 



CHAPTER I.— continued. 



No vegetable flourishes and fructifies as ofteu, 



No animal of similar regenerative fertility, 



Second ovarium rare, 



Pith, .... 



Site of the germ ? . . . 



Rudiments of the animal reposited below, 



Several regenerations in simultaneous progress. 



Root of the Tubularia, 



It does not diffuse as in the Sertularia, 



Diminished light impedes observation. 



Effect of wounds and lacerations, 



Monstrosities, 



Regenerations multiplied by artificial sections, 



Prolific elements found lower and lower in the stem. 



Excisions pernicious, .... 



Monstrosities, .... 



Symmetry is restored, .... 



J. D. Dana a modern learned author. 



His observations on the form of bodies. 



Monstrosities, . • • • 



Tendency to symmetry. 



No two bodies alike. 



Elements of the hydra remotely situated, 



Evolution and maturity depend on the pith. 



Seven perfect hydras, one abortive, produced in 395 days. 



Two generated in opposite directions. 



Conclusions, .... 



Reflections, . . . • 



Plates I., II., III., IV., explained. 



§ 2. TCB€LARIA LAKYNX, 



Large bodies more easily examined than small, 



Group like a tuft of flowers. 



Hydra with a double row of tentacula, 



Nascent Tubnlariae from ovarian cysts, 



Hydra deciduous, .... 



Seven heads regenerated in 66 days. 



Degeneration concomitant on reproduction, 



Theory of germs from vascular structure. 



Defective uniformity, 



Doris feeds ou the Tubularia larynx, 



Mode of dislodging it, . . • 



Plate V. explained, 



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