128 PRACTICAL HISTOLOGY. 



stratum of flat non-nucleated cells with irregular 

 spaces between them. 

 b. Huxley's layer, composed of a stratum of flat 



nucleated cells without fenestrae. 

 The structure of layers a and b can only be clearly 

 seen where they have been isolated by dissec- 

 tion. 



6. The cuticle of the root sheath, formed of a layer of 

 imbricated cells in contact with the cuticle of the hair. 



The inner root sheath and its cuticle seldom pass 

 higher than the openings of the sebaceous glands. 



231. Examine the following preparations: a. (H.) 

 T. S. hair follicle from scalp, preserved in glycerine or 

 .dammar. Layers i, 2, 4, 5 will be readily seen. 3 and 6 

 will probably be difficult to recognise. 



b. V. S. hair follicle of scalp. 



(L.) The follicle, usually somewhat oblique in position, 

 with the sebaceous gland or glands opening into the upper 

 part. 



(H.) The fibrous coverings of the follicle and the outer 

 root sheath may be readily seen, but it will probably be 

 difficult to see the others clearly. 



c. (L.) V. S. skin of dog digested ( 223, b} and pre- 

 served in glycerine. Examine the erector muscle of the 

 hair follicle, composed of non-striped fibres passing from 

 the lower part of the hair follicle to end in elastic fibres 

 close to the surface of the cutis vera, at a little distance 

 from the follicle, but on that side of it towards which the 

 hair slopes. It is rare to see the whole length of the 

 muscle in a single preparation. 



EYE. 



232. Cornea. Methods. a. The cornea may be readily 

 hardened in chromic acid, as directed in 13. This method 

 serves very well for the demonstration of the epithelium, 

 the elastic lamina, and the fibrous tissue. It may be 

 readily cut if imbedded in paraffin, and the sections un- 

 stained or stained with logwood, mounted in Farrants' 

 solution or in glycerine. 



