EXPLANATION OF THE PLATES. 207 



PLATE XXVHI. 



THE EYE. 



FIG. I. Section of the two external tunics of the eye- 

 ball at the junction of the cornea and sclerotica. 1, Sclerotica ; 

 2, cornea; 3, line of junction of these two parts; 4, canal of 

 Sehlemm; 6, conjunctiva; 7, corneal and conjunctival epithe- 

 lium ; 8, line of junction of conjunctiva and sclerotica ; 9, amor- 

 phous layer on the front of the cornea; 10, same layer on 

 posterior surface of cornea ; 11, iris ; 12, choroid ; 13, a ciliary 

 process. Magnified 25 diarn. 



FIG. II. Cornea, sclerotica, and conjunctiva. 1, Scle- 

 rotica ; 2, cornea ; 3, amorphous layer on front surface of 

 cornea; 4, junction of this layer with the conjunctiva; strati- 

 fied epithelium of the conjunctiva and anterior surface of cor- 

 nea. Magnified 300 diam. 



FIG. III. Section of cornea and iris. 1, Cornea ; 2, 

 anastomosing plasmatic cells ; 3, its posterior amorphous layer ; 

 4, junction of this layer with the sclerotica ; 5, its epithelial 

 investment which, reflected upon the anterior surface of the 

 iris, constitutes the membrane of Demours. Magnified 360 

 diam. 



FIG. IV. Ciliary muscle. 1, Sclerotica; 2, canal of 

 Schlemm ; 3, ciliary ring ; 4, ciliary processes in which nuclei 

 of muscular fibres are seen in the direction of their length at 5, 

 and in transverse section at 6 ; 7, external circumference of the 

 iris.. Magnified 120 diam. 



