X CONTENTS. 



PAET IV.— JERSEY. 

 CHAPTER T. 



Page 



Departure from Scilly — Jersey — Schoolboy recolleetions — Choice of a spot — 

 Prejudices against dissection — Zoology of Jersey — Trawling — Difficulties 

 of identification — A strange Ascidian — The Tadpole embryo of a Mol- 

 lusc — A paradox — Development of Medusae from Polypes — All animals do 

 not come from eggs — Reproduction of the Hydra — History of Partheno- 

 genesis — ^A discovery — Animals produced from germ-cells only — Steen- 

 strup's theory — Owen's theory — A new theorj' — The three forms of repro- 

 duction : fissiparous, gemmiparous, and oviparous — Wliat is partheno- 

 genesis? 283-340 



CHAPTER II. 



Summer delights — Medusje-hunting — Noctiluca and the phosphorescence of 

 the sea — The Cydippe — Vivisections — Do the lower animals feel pain ? — 

 Chance-weed — A new Polype — A new Polyzoon — Vitality of Molluscs — 

 Vision of the MoUuscs — Are images formed on the retina ? — Description of 

 the retina in vertebrates and invertebrates — New theory of vision — Tac- 

 tile sensations and nerve filaments — Can the MoUuscs hear ? — The senses 

 of animals not superior to those of man — The ocean-currents caused by 

 Molluscs, 341-379 



CHAPTER III. 



How to catch Razor-fish — The Corkscrew Coralline — ^Danger of a 'priori 

 views in zoology — Examination of the nervous system of MoUuscs — 

 — Doubts respecting current doctrines of nerve-physiology — Absence of 

 nerve-fibres — Origin of sensibUity — SensibUity in the absence of nerves — 

 On the relation.between organ and function — Conclusion, . . 380-412 



GLOSSARY, 413 



INDEX, 417 



DESCRIPTION OF THE PLATES, 426 



