. The microscope and its revelations. pound eves, the im-portance of the result obtained by the ingenuity and skill of ProfessorExner is great, giving us a ne\\ start on solid ground. The mathe-matics of the question are fully discussed by Exner in a memoir, to EYES 985 which the student must be referred for complete Thekind of image formed by the compound eye has long been a matterof discussion amongst The process of taking the photo-micrograph copied in fig. 734was this : The eye of the Lftmpyiis was carefully dissected out fromthe head, the retina and pigment r
. The microscope and its revelations. pound eves, the im-portance of the result obtained by the ingenuity and skill of ProfessorExner is great, giving us a ne\\ start on solid ground. The mathe-matics of the question are fully discussed by Exner in a memoir, to EYES 985 which the student must be referred for complete Thekind of image formed by the compound eye has long been a matterof discussion amongst The process of taking the photo-micrograph copied in fig. 734was this : The eye of the Lftmpyiis was carefully dissected out fromthe head, the retina and pigment removed with a fine camel-hairpencil, and the back of the eye immersed in a mixture of glycerinand water, possessing a refractive index of 1346; this was alreadyknown to be the refractive index of the blood of the Lcmvpyris. Thewhole was placed upon an ordinary cover-glass, this being fixed byits edges to a slide or object-carrier with a circular aperture cut init, as in fig. 735, 0 ; a is the slide with an aperture less in diameter D. FIG. Too.—Diagrammatic illustration of the method by whichthe image in fig. 7M4 was photo-micrographed. than the cover-glass b cut through it; c is the fluid-medium of«= 1-346 in which the back parts of the eye are immersed, thusfulfilling the conditions of living sight, while the cornea, with itslenses is shown at d, being, as in the normal state, in air. If the eye 1 Sitzitngsber. Akcul. U7>K, Bd. xcviii. (1889), pp. lo, 143 ; also /Physiologic i1/ir facettirten A/njm r•<•.Jini/. ,Sof. Loud, vol. Iv. p. S5. The question of the physiology of the compound eyeof Arthropods has given rise to much discussion. For further details as to itsstructure consult Gren
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