54 



THE EXTERIOR OF THE HORSE. 



indicates a fulness of the ocular cavity and the temporal fossa, the size 

 and development of the muscidar system in general, and the amplitude 

 of the field of vision. 



3. Its perfect equality with that of the opposite side. 



4. Its deep coloration and the intensity of its reflection, a white or 

 pale color being symptomatic of more or less serious diseases. 



5. Its freedom from blemishes of the cornea and the transparency of 

 the media. Alteration in these always manifests itself by an opacity 



and the appearance of 

 " ^ , abnormal colorations, 



whence results a vari- 

 able degree of imper- 

 meability to light. 



6. The extent and 

 quickness of the move- 

 ments of the iris, im- 

 mobility indicating 

 complete insensibility 

 of the retina to the im- 

 pressions of luminous 

 vibrations. The pupil 

 should contract in the 

 presence of light, and 

 dilate in darkness, in 

 order to proportion the 

 retinal sensibility to the functional delicacy of this membrane. 



7. A mean convexity of the cornea, too much or too little character- 

 izing a myopic, a hypermetropic, and not a normal eye. 



8. The black coloration of the pupil, which denotes a perfect trans- 

 parency of the crystalline lens, and indicates the reflection of the black 

 color of the choroid and the ciliary body situated behind. 



9. The integrity, fineness, absence of blemishes, and mobility of the 

 eyelids, all other qualities of these organs indicating imperfections and 

 functional impairment. 



10. A rosy tint of the conjunctiva, its redness, paleness, and infiltra- 

 tion being symptomatic of a general or local inflammatory state, of a 

 congestive state, or of profound organic debility. 



11. The clearness and little abundance of the tears, the dryness 

 of the eyelids, the large development and good direction of the eye- 

 lashes. 



12. Finally, the vivacity, chaiigeablene^s, and frankness of the ex- 



FiG. 23.— Normal eye. 



