Rensselaer Republican, Volume 14, Number 27, Rensselaer, Jasper County, 23 March 1882 — ANATOMY OF THE EVE. [ARTICLE]

ANATOMY OF THE EVE.

by Dr, Sealing titaMitfWi iiiWhicepinl Society. (*>Ak ikehdit dnehtlng m«N» I held ufc Ewmaste »y^”‘rHl>‘BaWV“ , ‘The more prgatuzld She t inflivid ual, the ! more 18 ..apparatus whicli conveys the impression 1 oft wre outside wqrld -T ‘tss ifs oWnJr, While eertatrt dnnW^s'df the lower classes pofl-ess.pinly a .small pigment dot fVoni \\ tftp. leads to.; their sfffwastt and’dtfritfiebs. thO higher olMtes pissess at the end of their nwriesfof vision a mofe. ,gi lflsa.pomplete optical nt t» varihtfotw hf the physical * J6onditions aud> Objects of. the outside, 'worjdi, Tfr&abim tq m distinct, SAHUphS vefiwtbd f -(frbW J sofrbtndittg objects and carrying them, id regular order to isolated Ppint* of ;th? optic nerve, by Sects and eruetaeeans have eyes of this description, cut of the least per-, fact fprxmandjM mqat cases, cab 'only see dbhicis yhiph are in the prplongation T bfthe radial akis of the eye, but Canriotojugde of distances. - In’ the moke highly organised animals the eye ip. tfufmsbed with a oamera obscura, single kky fVdtk each fmi nt 6f the opjeot yiew«di,i trn othdrs'the bpehihg re iargei;, and.thus giVfes more' illumination. tt. , . ; ~.i “In the. highest of object-seeing eyes there Id/borideS ‘ the camera. ob», scura, a collecting lens, or an eye qonfpctjsdiW thetSame, general plan he 1 lawteffl bavfc a bertkln poiwfef of adripthblllty whicli lsiwaatinr in the other form*” ;, Ths deotor then described the different part? + pf the buman eye, whidh he llTustrated by models, drawings, and freshly hdsides humeraus microscopic.riides. ’H!e showed fab# 1 each parfc-was supplied with blood> vessels.ajijd pfierves, besides the cell Structure of eaob. as shown by the- mh proscopfe. Special reference was made to and' : the cryshaljdxrerißns. ■ In speaking Of the iris, he showed that thei uvea, or its posteriorcpyerina. consisted of a thick felratuhi orceils, which are round, densefy ,picked and filled with dark pigment molecules. This pigment layer is only sparely developed in light clue,.eyes, fnd, .almost, totally wantingifa the eyes, of the Albinos; yhile in'dark eVesTt is richer, and giro* to the eye a dark brown or black appearaucA :T.he oj*is, as *, rule; is a spff, loose tissue and can be. atretehtd. out tnbre than half without tearipg. •Him• retinai-whiehds the-most important and most pigl»4y orgapived tiisue 6f thtej^jtei: fnma' j i)pe i optic sue, upon the structure of which hisitologist* by meapa agree. 4 . Ih phCfkliMoffthe.rpds and - ,o«ines ofthfe retina>€nedoctor said that in many animals the cones are wholly wanting, and we always find this to be the case ip thejqtlpae,o£ suph ammals aS iW mole,

and many others. Birds with acute vftiWhaTOrtbe-retina plentifully supr •ptreiFwltft cdh&l; as much so as the retinaof rnanu. Those birds) whi'ch prefep twilight—as the but very tew and small conestlfi the retii na.« Tliete is peculiarity!' ip the cones of birds. Each has a powerfully reflecting globule of an intensely yellow pi req cqjqr c&nnected with its eXtrafflJty, through; Which the light hltetoiyiis.f' Tfalfoughout the animal kingdom, where only imperfect Vision is needed, and no distinct perception of colors is required, a quantitative supply o£ light only being.demanded, ,the rods are found at the exEense of the cones. On the other and, wherewer.we find aaulenesS, of vision; wltll a nice' distinction bf colt ! sis, there we find the cpnes largely mretailijig, V>r /exclusively existing. To perfect vision three things are, .essential :• The perception of light, perception of colors, and the condep*-' tionoaf space. The first function may be Jjerformyd ky tfte rod* alone. The cqpeg evidently connected with the seootid, kna - with the third. The kt ructare bf the brystailinO'ieiis, the moqt important light refracting medium of the, is ’also very interesting. .The multiplication of centicular fibres' is quite, active at birth, but diminishes as age advances, and in later years ceases altogether. The deep seated fibres of the lens disappear by atrophy, and get more rigid, so that the lens becomes more solid, lees elastic, ynd ramie flattened. »H of which.-obvi-otisly, has its/influence on the aceommndatiuc action, with such regularity .that it may be>denominated a fixed physiological law that “eyes have a certain accommodative power at a certain age.” 1 mm i ' ' - • -Thkcashier of a Ban Francisco banking firm arranged an invalid chair at his .desk in eueh a manner that he could work sitting up or reclining, as he plegsed. His (employers objected on the ground that it did not look business like. They discharged him, but'hb ip .* as hehail a.cohtraot for ,ia years. ,«Piptey ttHertf.' A court will-dCeidn the . tna fei'iuun •••■ i . .. Ohio has a larger number of umes in her college libraries thatfUuy othfeFktAte in the Union."‘She leads Idff wRh*3L2,572 volumes; Massachudefies next with 272,628 volumes, laufl&iittuXew York with 237,224 volVWB»8. ».*- ■. - B V*A4< .4 ■ - v. -Mt