266 THE ANATOMY AND PHYSIOLOGY OF THE FOOT. 



sensitive laminae ; the dark lines representing the sensitive 

 laminae, and the white the homy laminse, which form the 

 inner wall of the crust ; i, the outer wall of the crust, con- 

 sisting of dark horn. 



Fig. 3. The sensitive parts exposed — the sole of the foot 

 shown after the horn has been removed. — a, The sensitive 

 frog ; b, the sensitive bars ; the white line between the bars 

 and frog representing the part of the foot which secretes the 

 horny commissure that unites the bars and frog; c, the 

 sensitive sole ; d, the heels ; e, the fissure of the frog'; //, 

 the reflection of the sensitive laminee forming the bars ; g, 

 the reflection of the coronet forming the frog. The spo'no-y 

 substance, represented to the left of the spectator, be- 

 tween '„ and b, show that the subject whence this drawing 

 was taken was only saved by death from an attack of 

 canker. 



Fig. 4. The sensitive lamina exposed by removal of the 

 horny box. — a, The secreting coronet; b, the sensitive 

 laminee ; c, the reflection of the coronet going to form the 

 sensitive frog; d, the reflection of the sensitive laminae 

 going to form the sensitive bars ; e, the toe ; /, the quarters ; 

 g, the heels. 



