Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . Fig. 58. THE SENSES. 189 same reason an oar or a stick, when partly immersed inwater, will appear bent in proportion to its obliquity. 390. The rays of light which fall upon the cornea ofthe eye are refracted towards the pupil, both by the dens-ity of the cornea and aqueous Irumor, and by the con-vexity of the cornea, which causes the rays, to fall on itmore obliquely. 391. After passing through the pup
Class-book of physiology : for the use of schools and families : comprising the structure and functions of the organs of man, illustrated by comparative reference to those of inferior animals . Fig. 58. THE SENSES. 189 same reason an oar or a stick, when partly immersed inwater, will appear bent in proportion to its obliquity. 390. The rays of light which fall upon the cornea ofthe eye are refracted towards the pupil, both by the dens-ity of the cornea and aqueous Irumor, and by the con-vexity of the cornea, which causes the rays, to fall on itmore obliquely. 391. After passing through the pupil, the rays of lightcontinue to be refracted by the crystalline lens and vitre-ous humor, so that they meet in a focus on the retina,where a complete inverted image or picture of the objectis thus formed. This isshown in fig. 58, where,for the sake of conve-nience, two rays only arerepresented as issuingfrom each of the two extremities of an object, a, c. Thoserays cross each other in the middle of the eye—thosefrom a being brought to a focus at b, and those from c atd; and as all the other rays are refracted in the same man-ner, a complete inverted picture of the object is formed at
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