1. Pfluger's Archiv. f. d. ges;Garten;Physiol., Vol. LXXI; 2. v. Gilse
2. Cotnptes rendus d. 1;Rademaker; Garain,1932
3. Rademaker and Garcin.-Loc. cit.
4. of Exp;Ponder, E.; Kennedy, W.P.Quart Ji;Physiol., Vol. XVIII,1928
5. 25, 1925. In a communication which he made to the Royal Society in 18231 there occur the following statements (Page 177) On the Two Conditions of the Eye, its State of Rest and of Activity. " The eye is subject to two conditions, a state of rest with entire oblivion of sensation, and a state of watchfulness during which both the optic nerve and the nerve of voluntary motion are in activity. When the eye is at rest, as in sleep, or even when the eyelids are shut, the sensation on the retina being then neglected the voluntary muscles resign their office and the involuntary muscles draw the pupil under the upper lid. This is the condition of the organ during perfect repose;Symonds, C.P.Brit;Med. Jl,May