194 



ELEMENTARY PHYSIOLOGY 



The number of these glands varies in different parts of 

 the body. They are fewest in the back and neck, where 



Pio. 59. 



A, a longitudinal and vertical section of a nail ; a, the fold at the base of 

 the nail ; b, the nail ; c, the bed of the nail. The figure B is a transverse 

 section of the same — a, a small lateral fold of the integument ; 6, nail ; 

 c, bed of the nail, with its ridges. The figure C is a highly-magnified 

 view of a part of the foregoing — c, the ridges ; d, the deep layers of 

 epidermis ; e, the horny scales coalesced into nail substance, (b'igs. A 

 and B magnified about 4 diameters ; Fig. C magnified about 200 

 diameters.) 



their number is not much more than 400 to a square inch. 

 They are more numerous on the skin of the palm and 



