THE CUTICLE. 



235 



Fig. 99. 



Fig. 100. 



Perpendicular section of skin of 



ear, magnified 10 diameters. 

 Epidermis of dog, magnified 20 diameters. 



skin may be gathered from the perpendicular section of that of the ex- 

 ternal auditory meatus in Fig. 100. <z, the derma ; , rete mucosum ; 

 , horny layer of epiderma ; d, coil of ceruminous glands ; 6, their excre- 

 tory ducts ; y, their apertures ; <?, hair-sacs ; A, sebaceous glands ; 2, 

 masses of fat. (Kolliker.) 



Fig. 101 shows the under surface of the cuticle detached by macera- 

 tion from the palm, exhibiting double rows of depressions, in which the 

 papillae have been lodged, with the hard epithelium lining the sudoripa- 

 rous ducts in their course through the cutis. Some of them are con- 

 torted at the end, where they have entered the sweat gland. (Todd and 

 Fig. 101. Bowman.) 



Fig. 102, papilla? of the 

 palm, the cuticle being de- 

 tached. (Todd and Bow- 

 man.) 



Fig. 102. 



Under surface of the cuticle. 



Papillse of palm, magnified 35 

 diameters. 



Fig. 103, surface of the 

 skin of the palm, showing the 

 ridges, furrows, cross grooves, 

 and orifices of the sweat - 

 ducts. The scaly texture of 

 the cuticle is indicated by the 

 irregular lines on the surface. 

 (Todd and Bowman.) 



