  | PROBLEM I. THE NATURE OF LIFE. | | CHAPTER I. | | PAGE | | The Problem stated | 3 | | (The Position of Biology) | 4 | | (Organisms) | 8 | | (Vital Force) | 14 | | (Vital Force controlling Physical and Chemical Forces) | 16 | | CHAPTER II. | | Definitions of Life | 24 | | CHAPTER III. | | Organism, Organization, and Organic Substance | 37 | | (Organism and Medium) | 45 | | (The Hypothesis of Germinal Matter) | 57 | | (Organisms and Machines) | 67 | | CHAPTER IV. | | The Properties and Functions | 70 | | (Does the Function determine the Organ?) | 78 | | CHAPTER V. | | Evolution | 89 | | (Natural Selection and Organic Affinity) | 115 | | (Recapitulation) | 152 | | PROBLEM II. THE NERVOUS MECHANISM. | | CHAPTER I. | | Survey of the System, | 157 | | (The Early Forms of Nerve-Centres), | 168 | | (The Peripheral System), | 171 | | (Ganglia and Centres), | 172 | | CHAPTER II. | | The Functional Relations of the Nervous System, | 176 | | CHAPTER III. | | Neurility, | 189 | | (Origins of Nerve-Force), | 201 | | (The Hypothesis of Specific Energies), | 207 | | CHAPTER IV. | | Sensibility, | 211 | | CHAPTER V. | | Action without Nerve-Centres, | 227 | | CHAPTER VI. | | What is taught by Embryology?, | 237 | | CHAPTER VII. | | The Elementary Structure of the Nervous System, | 251 | | (Difficulties of the Investigation), | 252 | | (The Nerve-Cell), | 258 | | (The Nerves), | <
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