CHAP. VIII 



SKIN 



127 



figured in this chapter for yourself, the directions' given on 

 PP- I 35 J 39 are simple enough to be carried out with very 

 limited appliances. 



FIG. 38. Vertical section of the frog's skin, Highly magnified. 



D. derm, formed of hf. hf . hf". horizontal, and v.f. vertical fibres of connective- 

 tissue, and containing b. v. blood-vessels, and pg. pigment cells. E, epiderm, 

 with m. 1. active or Malpighian layer, and h. L horny layer of epithelial 

 cells ; c. gl. cutaneous gland in section ; c.gl '. in surface view ; d. duct. (After 

 Howes.) 



The Skin. A vertical section of the skin, i.e. one taken at 

 right angles to its surface, will be seen to have the following 

 structure. 



