The reactions of Ranatra to light

1. I S T R 0 I ) l : C T I O S . 11. GENERAL HABITS. 111. REACTIOSS ' K O LIGHT. I-General features of jthe phototactic respome. ;?--The negative reaction. 3-Head and swaying movements in negative phototaxis. 4-The effect of contact on phototaxis. +The effect of temperature on phototaxis. 6-Phototaxis leading to fatal results. ?-Inhibition of phototaxis by other activities. S-The effect of hemisecting the brain. *The effect of covering the anterior half of the eyes. ro-The effect of covering the posterior half of the eyes. I I T h e effect of destroying or covering one eye. 12-Reactions of specimens with only a small part of the lateral sur-