TIII: i\ 1 1 ;> MI \ i \i;y . 



09 



tions is confounded with the frog and s >le ; the lower appears betueen these 

 two parts, and is effaced at a certain distance from the point of the frog. 



SOLE. The sole is a thick horny plate comprised between the inner bor- 

 di r "f the wall and its reflected prolongations ; thus occupying the inferior 

 face of the hoof. It offers two faces and two borders or circumferences. 



The inferior, or external face, forms a more or less concave surface, 

 according to circumstances. The superior, or interim/ /.;,-.. < .in >pond> t. 

 the i>eripheral portion of the velvety tissue ; it shows a multitude of little 

 apertures analogous to those of the cutigeral cavity, into which are inserted 

 the papilla- of the keratogeuous membrane. 



The external border, or large circumference, is united, throughout its 

 extent, to the inner contour of the lower border 

 of the wall, by means of its denticulae, which 

 are reciprocally dovetailed into those on the 

 inner face of the wall near its inferior border. 

 The internal border, or small circumference, is a 

 deep, V-shaped notch, widest behind, which cor- 

 responds to the bars, and at the bottom of which 

 the point of the frog is fixed. 



FBOG. This is a mass of horn, pyramidal in 

 shape, and lodged between the two re-entering 

 portions of the wall. It offers four planes (or 

 sides), a base, and a summit (or point). 



The inferior and the two lateral planes con- 

 stitute the external surface of the organ. The 

 first is hollowed by a longitudinal excavation, 

 which is shallow in well-formed hoofs, and is 

 named the median lacuna of the frog, separating PLANTAR OR GROUND SURFACK 

 the two salient portions, or branches, which di- OF A HOOF; RK;IIT FOOT. 

 verge posteriorly and join the heels. The other 

 two planes are directed obliquely downwards and 

 inwards; they adhere closely, at their upper third, 

 to the external side of the bars, and anteriorly 

 to the inner border of the sole. " This union 

 is so close that no line of demarcation is appa- 

 rent between these parts, and their separation 

 can only be obtained by prolonged maceration. 

 Tin non-adherent, or free portion, forms the inner 

 side of the angular cavities known as the Intern! 

 lacunas, or commissures of the frog, whose external 

 side is constituted by the inferior face of the bars." Bouley. 



The superior plane, forming the internal face of the frog, is cribbled 

 with holes like that of the sole, and is exactly moulded on the pyramidal 

 body of the plantar cushion. It also offers a triangular excavation, divided 

 posteriorly into two latter channels by a prominence directed from before 

 backwards, to which Bracy Clark gave the name of froij-statj. but which 

 M. Bouley prefers to designate the stay (arete} ../////-,/. 



The baxe or posterior extremity of the frog, constituted by the extremities 

 of its branches, forms two rounded, flexible, and elastic eminences separated 

 from each other by the median lacuna; they cover the angles , f intl, \i,,n of 

 the wall, and are continuous at this point with the pcrioplic band. Bracy 

 Clark named them the (jlomes of the frog. 



With regard to the summit, or anterir .\tnmityof the organ, it i- a 



The interval from a to a repre- 

 sents the toe ; From a to b, b, 

 outside :m<l inside ijinrtt-rs ; 



c, o, Commencement of l>ar> : 



d, d, Inflexions of wall at the 

 heels, or " buttresses ;" e, La- 

 teral lacuna; /, /. /', Sole: ./, 

 White lin<- : /', .'/', I'" 

 twi-i-u tin- >"i,- .iii'l liar: /<, 

 1'Midy of frog; i, Itranch of 

 frog; k, k, Glomcs, or h. !-, of 

 frog; /, Modiau la- -1111.1. 



