268 ELEMENTAKY PHYSIOLOGY. [XXVI. 



bundles of circular fibres, the circular muscle 

 of Miiller, inside the longitudinal fibres will 

 be seen; in many lower mammals this part 

 of the ciliary muscle is small or absent.) 



d. The pigment-layer of the retina continuing 

 forwards to form the uvea of the ciliary pro- 

 cesses and of the iris. Inside this is a simple 

 layer of columnar cells without pigment, this 

 is a continuation of the inner coat of the 

 retina. 



e. The canal of Schlemm at the junction of the 

 cornea and sclerotic. 



2. In sections of a cornea which has been hardened 

 in mercuric chloride, and stained (cp. also p. 251), 

 observe 



a. The anterior epithelium. In this note 



a. The external flattened nucleated cells. 



yS. The middle layers of roundish but ir- 

 regular cells. 



y. The internal single layer of columnar 

 cells placed perpendicularly, cp. Lesson 

 XXIV. A. 



h. The body of the cornea. Note 



a. The narrow transparent zone immedi- 

 ately beneath the epithelium, the an- 

 terior basement membrane of Bowman. 



y3. The rows of connective-tissue corpuscles 

 seen in profile, with numerous branches 

 communicating not only with the ceils 



