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George John Romanes. Jelly-Fish, Star-Fish, and Sea-Urchins: Being a Research on Primitive Nervous Systems
Jelly-Fish, Star-Fish, and Sea-Urchins: Being a Research on Primitive Nervous Systems
Table of Contents
PREFACE
INTRODUCTION
CHAPTER I. STRUCTURE OF THE MEDUSÆ
CHAPTER II. FUNDAMENTAL EXPERIMENTS
Effects of excising the entire Margins of Nectocalyces
Effects of excising the entire Margins of Umbrellas
Effects of excising Certain Portions of the Margins of Nectocalyces
Effects of excising Certain Portions of the Margin of Umbrellas
Effects upon the Manubrium of excising the Margin of a Nectocalyx or Umbrella
Summary of Chapter
CHAPTER III. EXPERIMENTS IN STIMULATION
Mechanical, Chemical, and Thermal Stimulation
Luminous Stimulation
Electrical Stimulation
Period of Latency, and Summation of Stimuli
Effects of Temperature on Excitability
CHAPTER IV. EXPERIMENTS IN SECTION OF COVERED-EYED MEDUSÆ
Rate of Transmission of Stimuli
Stimulus-waves
Exhaustion
Ganglia appearing to assert their Influence at a Distance from their own Seat
Regeneration of Tissues
CHAPTER V. EXPERIMENTS IN SECTION OF NAKED-EYED MEDUSÆ
Distribution of Nerves in Sarsia
Distribution of Nerves in Tiaropsis Indicans
Staurophora Laciniata
CHAPTER VI. CO-ORDINATION
Covered-eyed Medusæ
Naked-eyed Medusæ
CHAPTER VII. NATURAL RHYTHM
Effects of Segmentation on the Rhythm
Effects of Other Forms of Mutilation on the Rhythm
Effects of lessening the Amount of Tissue adhering to a Single Ganglion
Effects of Temperature on the Rhythm
Effects of Freezing Medusæ
Effects of Certain Gases on the Rhythm
CHAPTER VIII. ARTIFICIAL RHYTHM
CHAPTER IX. POISONS
Remarks
Physiological Effects of Fresh Water on the Medusæ
The Fresh-water Medusa
CHAPTER X. STAR-FISH AND SEA-URCHINS
Structure of Star-fish and Sea-Urchins
Modifications of the Star-fish Type
Natural Movements
Stimulation
Section
Special Senses
Footnote
