THE FOOT. 363 



Symptoms. — Circular patches in various parts of the 

 body, characterised by the absence of the hair, the pre- 

 sence of vesicae near the outer margin, and a scurfy 

 condition of the central parts ; here and there in the ring 

 may be seen a dry looking hair, of a greyish colour, 

 somewhat twisted at the root, or the stump of a hair 

 which has broken off. Megnin considers the true Tinea of 

 the ox distinct from that of the horse, and terms it 

 T. decalvans or T. dejpilens. This he finds to be generally 

 nearly three times the size of T. tonsurans, to give rise 

 to more formidable symptoms when communicated to the 

 horse by inoculation, and to induce a different condition 

 of the affected hairs. In calves, the disease affects the 

 eyes, ears, neck, withers, and limbs. These cases must 

 be treated with the same applications as suggested for 

 T. favosa. 



Section 2. — ;Diseases op the 



The foot of the ox, in a zoological sei 

 the structures from the knee and hock (inclii^ 

 wards in the fore and hind limbs. Custom sanctiol 

 application of the term foot to the inferior part of each ex- 

 tremity from the fetlock-joint downwards. From a 

 pathological point of view it matters little which view 

 we adopt. Suffice it to say that the knee of the ox 

 is remarkable for the peculiar manner in which it is 

 bent inwards in consequence of the obliquity upwards 

 and outwards of the inferior articulatory surface of the 

 radius, whence the proverbial term " Calf -kneed.'' That 

 the ulna meets the carpal bones, os pisiforme (Trapezium) 

 is less developed than in the horse, that the trapezoid 

 and magnum are fused into a single bone, and no true tra- 

 pezium is present. The metacarpus consists of a rudi- 

 mentary splint bone on the outer side, and of two fully 

 developed metacarpals blended together along the central 

 line, separating inferiorly, each division bearing three 

 pastern bones and a navicular, resembling moieties of the 

 corresponding bones in the horse. The two diverg- 



