THE SKIN. 

 Fig. 321. 



481 



Under surface of the cuticle, detached by maceration from the palm ; showing the double row of 

 depressions in which the papillae have been lodged, with the hard epithelium lining the sweat- 

 ducts in their course through the coriurn. Some of these are contorted at the end, where they 

 entered the sweat-gland. (Magnified 30 diameters.) 



and the back of the hand; yj^ to 5 \ of an inch on the flexor side 

 of the fingers and toes. 



It is 3*5 to ^ of an inch on the palm, and y 1 ^ to | of an inch in 

 the sole of the foot; though here the varieties are greatest. 



As compared with the horny layer (cuticle) alone, the stratum 

 Malpighii is in some localities always 2J to 4J times the thicker; 

 viz., in all parts of the face, in the hairy scalp, the penis, the scro- 

 tum, the nipple, and the skin of the thorax in man; in the labia 

 majora and minora, and on the back of the hand and neck. In the 

 glans penis the stratum Malpighii and the cuticle are of equal thick- 

 ness. In other parts of the body the two layers are either equal in 

 thickness, or the horny layer is 2 to 5 (or sometimes 10 to 12) times 

 as thick as the Malpighian. 



The thickness of the stratum Halpighii (at the base of the pa- 

 pillae) varies between y^^ and ^ of an inch. When thicker than 

 the horny layer, it averages ^J T of an inch; when thinner, to 



f an inch. 

 31 



