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Definition of mind—The correlation of physiology, morphology, and psychology—The presence of nerve-elements in monera—Conscious and unconscious mind—Unconscious ("vegetative") mind in the jelly-fish—Anatomy, physiology, and psychology of the jelly-fish—The origin of conscious mind. 1
[CHAPTER I]
The Senses in the Lower Animals
The sense of touch—The senses of taste and smell—Actinophryans having taste—The sense of sight—Modification of sight organs by surroundings—Sight in Actinophryans—Blind fish sensitive to light—Blind spiders—Blind man—Primitive eyes in Cymothoe—In the jelly-fish, sea-urchin, Alciope, Myrianida—The sight organs of the snail—Power of vision in the snail—Eyes of crayfish—Compound eyes—Vision in "whirligig beetle"—In Periophthalmus—In Onchidium—In Calotis—Organs of audition—In Lepidoptera—Hymenoptera—Orthoptera—Diptera—Hemiptera—Dyticus marginalis—Corydalus—Ears of grasshopper and cricket—Of the "red-legged locust"—Of flies—Of gnats—Auditory vesicles of horse-fly—Ears of butterflies—Cerambyx beetle—Long-horned beetle—Cicindelidæ—Carabidæ. 7
[CHAPTER II]
Conscious Determination
Definition—How conscious determination is evolved from the senses—The presence of nerve-tissue in Stentor polymorphus—The properties of nerve-tissue—Romanes' experiment with anemone—Action of stimuli on nerve-tissue—Reflection—Origin of consciousness—Time element in consciousness—Conscious determination in Stentor polymorphus—In Actinophrys—In Amœba—In Medusa—In a water-louse—In a garden snail—In the angle-worm—In oysters—In a ground wasp. 39