46 



HORSESHOEING. 



is completely enclosed by the hoof. Although it is only an ex- 

 tension of the derm or middle layer of the hair-skin, it differs 

 from the latter in structure and relations. 



In order to study the pododerm we should not wrench the 

 hoof off with violence, but should allow the foot to partially de- 

 compose by leaving it for six to eight days at ordinary room tem- 

 perature; it can then be 

 removed without injuring 

 the pododerm. After the 

 hoof has been removed the 

 entire pododerm presents a 

 more or less dark-red color 

 (flesh-color), which is due 

 to the great number of 

 blood-vessels that it con- 

 tains. For this reason dif- 

 ferent parts of the podo- 

 derm have received the 



prefix " fleshy," as for ex- 

 Foot from which the near half of the horny wall , n i m n ^ 

 and a greater part of the so-called fleshy wall have ample, neSUy Wall, HCSny 

 been removed, in order to show the relation of the g^l- flaclrvr -frncr e^fn TVip* 

 lateral cartilage to adjacent structures: a, vertical =01 C, ueSUy irog, CtC. XUe 

 section of the skin prolonged downward tlirough the pododorm is what the UU- 

 pododerm (foot-skm) to show clearly that the latter ^ 



isbut a continuation of the former; a', hairless place informed horSCShoer Calls 

 on the skin; b, perioplic band; b', line indicating the 

 upper border of the same; 6", surface of section of 

 the periople, or perioplic horn-band; c, coronary 

 cushion; c', (left) line which marks the upper border 

 of the coronary cushion; c", section of wall at the 

 toe; d, podophyllous tissue (sensitive laminae); e, 

 horny sole; /, white line; ff, horny frog; h, fleshy frog; 

 t, lateral cartilage. 



the " quick." I will here 

 remark that the three 

 layers of the external or 

 hair^skin are represented 

 in the foot; however, the 

 epidermis is in an entirely different form, — namely, the homy 

 box or hoof. The internal layer or subcutaneous tissue of the 

 hair-skin is absent in those parts of the foot where the pododerm 

 covers the os pedis. There remains, therefore, only the middle 

 layer, derm, or pododerni', which secretes the hoof, and which is 

 the prolongation and representative of the middle layer of the 

 hair-skin. The pododerm is distinguished from the derm of 



