266 DISEASES OF THE HORSE’S FOOT 
pedis sinks, be carried with it. As a consequence we get a 
marked depression at the coronet (see Fig. 117, a), which 
depression may be often noticed after the second or third 
week of a severe attack of the disease. 
Here, again, though to a greater extent than that caused 
by the hemorrhage alone, the os pedis appears to be pushed 
backwards, the space at the toe between the bone and the 
horny box being closely filled with the yellow, slightly 
blood-stained exudate. This condition is well depicted in 
Fig. 117. 
Fig. 117.--LoneitupInaL SECTION oF a Foot witH LamMINITIS 
oF FourtEEN Days’ STANDING. 
a, The depression at the coronet caused by the dropping of the bony column 
within the horny-hox ; 6, a portion of the sensitive sole pushed down- 
wards and forwards by the descending os pedis. 
With the descent of the os pedis we get in many cases 
a penetration of the horny sole (see Fig. 117), leading 
always to serious displacement of the sensitive sole (see 
Fig. 117, b), and often to caries of the exposed bone. 
The backward displacement of the os pedis may be 
accounted for in two ways. Firstly, the greater vascularity 
of the membrane covering its front leads to a greater out- 
pouring of inflammatory fluid in that particular position. 
Here, therefore, loss of adhesion with the wall is greatest, 
while into the cavity so formed is poured a large quantity 
