EXPLANATION OF PLATE II. — CONTINUED. 



/, h, 0, A line drawn from /to h, representing the basis of a triangle 

 whose apex is at o, will include the osseo-cartilaginous deposit, 

 spreading from, the spavin tumor at the side, upon the fore part of 

 the cannon bone, where ib is partly covered by the tendon of the 

 flexor metatarsi, which is seen (at h) detached and turned down. 



r, The inner division of the bice2}S tendon of the flexor metatarsi, 

 divided and dissected, in its course to be inserted into the head of 

 the inner small metatarsal bone, which is buried deep in the sub- 

 stance of the tumor. 



I, The slender tendon of the flexor accessor ius, hanging down out of 

 its sheath. 



m. The tendon of the flexor pedis. 



n, The tendon of the flexor suffraginis. 



Fig. 3. The same spavin, after having been subjected to maceration. 



a, Os calcis. 



b, Large metatarsal or hind cannon bone. 



c, Small metatarsal or hind splent bone. 



d, Astragalus. 



e, The superior eminence of the ossification constituting the veritable 

 bone spavin, now, after maceration, having a rugged aspect, and 

 standing out in rocky prominences, in consequence of having be- 

 come deprived of its nidus or bed of fibro-cartilage. 



g, The inferior extent of ossification, spreading down for some distance 

 upon the cannon bone. 



f, f. The most prominent or perceptible parts of the spavin tumor 

 during life. 



h, The large cuneiform bone coated with osseous matter, of the same 

 porous nature as the tumor itself is composed of, from which, in 

 fact, it is an extension. 



I, The middle cuneiform bone, underneath the former, coated after 

 the same manner, and equally involved in the bone spavin disease. 



m, n, The osseous deposition, after completely burying the inner 

 cuneiform bone, as well as the head of the inner small metatarsal 

 bone, spreads in an outward and downward direction, and covers 

 the major 2^art of the superior-anterior portion, or head and neck 

 of the large metatarsal bone; so that there is, in point of fact, nearly 

 as much bone spavin in front us in the usual place upon the side of 

 the hock and cannon. 



