Chap, xxxvi.] THE CORNEA. 295 



angle of the eye, and closely placed against the sur- 

 face of the eyeball, a gland, called Hardens gland. 

 According to Wendt, this is either a true serous 

 gland, like the lachrymal as in the ox, sheep, and 

 pig or it is identical in structure with a sebaceous 

 gland, as in the mouse, rat, and guinea-pig ; or it 

 consists of two portions, one of which (white) is 

 identical with a sebaceous, while the other (rose- 

 coloured ) is a true serous gland ; such is the case in 

 the rabbit and hare. According to Giacomini, a 

 rudiment of Harder's gland exists also in the ape 

 and man. 



CHAPTER XXXYI. 



THE CORNEA, SCLEROTIC, LIGAMENTUM PECTINATUM, 

 AND CILIARY MUSCLE. 



409. I. THE cornea (Fig. 152) of man and many 

 mammals consists of the following layers, counting 

 from front to back : 



(1) The epithelium of the anterior surface (see 

 Fig. 15) ; this is a very transparent, stratified, pave- 

 ment epithelium, such as has been described in par. 

 22. It is directly continuous with the epithelium of 

 the conjunctiva, but it is more transparent ; in dark 

 pigmented eyes of mammals the epithelium of the 

 conjunctiva is also pigmented. In these cases the 

 pigment, as a rule, does not pass beyond the margin 

 of the cornea. 



410. (2) Next follows a homogeneous elastic mem- 

 brane, Bowman 's membrane, or elastica anterior. It 

 is best shown in the human eye, but is present, even 

 though only rudimentary, in the eye of mammals. 



