Chapter 1

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