CHAP. VIII 



SKIN 



127 



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

 PP- 135 — 139 3.re simple enough to be carried out with very 

 limited appliances. 







Y\Q. JO. — Verlibal section of the frog's hkin, highly magnified. 

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

 tissue,' and containing ^. z'. blood-vessels, and pg. pigment cells. E, epiderm, 

 consisting of ;;/. /. active or IMalpighian layer, and h, I. horny layer of epithelial 

 cells ; c.^gl. cutaneous gland in section ; c.g£ . in surface view ; d. duct. (After 

 Howes.) 



The Skin. — Avt^rtical section of the skin, i.e. one taken at 

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

 structure. 



