Abstract

(1)Eupagurus bernhardus has in its compound eye an apparatus that can distinguish polarized light like an analysator. (2) This extinction does not apply to all the polarized light, but only a certain amount of it, this may be concluded from the fact that in the former experiments the strength of vision in no case became zero. (3) Probably the analysator in the eye ofEupagurus functions as an extinguisher of the disturbing polarized light, for the sunlight reflected from the surface of water is polarized to an ample extent.

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