JOURNAL OF MICEOSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XVI, 



Illustrating Dr. John Denis Macdonald's paper on the 

 Minute Anatomy of some of the Parts concerned in the 

 Function of Accommodation to Distance, Avith Physio- 

 logical Notes. 



Fi<,'. 

 1. — Vertical section of the cornea and sclerotic of shark. 



a. Conjunctival epithelium. 



b. Cornea proper, composed of superimposed laminse corre- 



sponding with the wtiole area of the cornea. 



c. ribrous part of sclerotic. 



d. Cartilaginous portion of ditto. 



e. Points of ossiBcation near the surface. 



2. — Some few superficial ossific points seen in face, imbedded in the 

 cartilage. 



3. — Anterior surface of the iris of the pig in connection with the ciliary 

 muscle. 



a. Sphincter fibres. 



b. Decussating oblique muscular fibres. 



c. Pillars of the iris torn from their origin in the cornea. 



d. Annular muscle {sphincter ciliarls) occupying the inner wall 



of circular sinus, and resting upon the ciliary muscle. 



e. Fibrous bundles at the posterior part of the circular sinus, 



torn from their connection with the sclerotic. 



f. Ciliary muscle. 



4. — Posterior surface of iris, with ciliary processes m situ, also from the 



a. Sphincter fibres of the iris. 



b. Radiating fibres invested with faint decussating striae. 



c. Ciliary processes and folds. 



d. Distribution of vessels with pigmentary deposit in the 



meshes. 



5.— Vertical section of the fore part of the eye of the pig (diagramatie). 



a. Conjunctival epithelium. 



b. Anterior elastic lamina. 



c. Cornea proper. 



d. Posterior elastic lamina. 



e. Anterior chamber. 

 /. Iris. 



g. Pillars of the iris. 



h. The annular muscle {sphincter ciliaris) seen in continuity. 



i. Ciliary processes in posterior chamber. 



k. The pupil. 



/. The lens. 

 m. The canal of Petit. 



' n. The hyaloid membrane. 



0. Ciliary muscle. 



p. Choroid. 



q. Sclerotic. 



r. Fibrous bundles passing into the sclerotic. 



s. The circular sinus. 



