60 DISEASES OF THE HOESE'S FOOT 



Fig. 31 is a magnified perpendicular section of the wall. 

 In it the parallel dark striae are the horn tubules in longi- 

 tudinal section. The lighter strite represent the inter- 

 tubular material. 



Fig. 32 gives us the wall in horizontal section. To the 

 left of this picture we find the horn tubules cut across, and 

 standing out as so many concentrically ringed circles. In 

 the centre of the figure are seen the horny laminae, with 

 their laminellie, and the sensitive laminae. The right 

 portion of the figure pictures the corium. 



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Fig. 32. — Horizontal Section of Horn of Wall. 



Fig. 33 is, again, a horizontal section, cut this time at 

 the junction of the wall with the sole. To the left are seen, 

 again, the horn tubules of the wall, and to the centre the 

 horny laminae. In this position, however, the structures 

 interdigitating with the horny laminae are not sensitive, but 

 are themselves horny. As the diagram shows, they con- 

 tain regularly arranged horn tubules cut across obliquely. 

 It is this horn which forms the * white line.' To the 

 extreme right of the figure are seen the horn tubules of the 

 sole. 



There remains now but to notice the arrangement of the 



