. The microscope and its revelations. etina removed at the back of the eye of one of the highervertebrates. The demonstration was satisfactorily made, and the present Editoris indebted for a knowledge of the following details to the courtesyof a private communication from Professor Exner. The general result of the researches on the subject is presentedin fig. 734, which is the image at the back of the compound eye of Lainpjjris splettdiduld,(fire-fly), in the positionin which it would he por-trayed upon the retina, butmagnified 120 to the window pane aletter R cut out in blackwas
. The microscope and its revelations. etina removed at the back of the eye of one of the highervertebrates. The demonstration was satisfactorily made, and the present Editoris indebted for a knowledge of the following details to the courtesyof a private communication from Professor Exner. The general result of the researches on the subject is presentedin fig. 734, which is the image at the back of the compound eye of Lainpjjris splettdiduld,(fire-fly), in the positionin which it would he por-trayed upon the retina, butmagnified 120 to the window pane aletter R cut out in blackwas fixed; the distance ofthe window from the eyewas 225 cm., while the dis--tance of the church from thewindow through which it isseen in the magnified imagewas 135 paces. The result is unmistak-able ; there may appear to besome matters of interest stillneeding interpretation, butthese are explained in themonograph by Exner. givingthe complete details of themethod he adopted and themathematical explanation ofthe results he obtained. The. lni. 734.—Image of a window with theletter R on one of its panes, and a churchbeyond, taken through the compound eyeof Liiiiijii/ris splendidula,& magnified120 diams. rectitude of the image and the reversion of the R arecertainly noteworthy ; andas a contribution to ourknowledge of the physiology of sight in insects and other animals with compound 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
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectmicrosc, bookyear1901
