lo LIST OF ILLUSTRATIONS 



34. Brusasco's eye-protector for dog applied 153 



35. Injury of the globe of horse 165 



36. Enucleation of the eye of horse 171 



37. Principal focus of a convex lens 182 



38. Conjugate focus of a convex lens 183 



39. Virtual focus of a convex lens 183 



40. Principal focus of a concave lens 184 



41. Virtual image of a convex lens 184 



42. Virtual image of a concave lens 185 



43. Image formed by a convex lens 185 



44. Diagram illustrating the visual path and the relation of the 



visual field 192 



