m 



MR. FLEMING, RISE AND EXPLAIN. 



THE "SOLAR ZONE." 



There is a white line that marks the line of junction of the sole 

 and wall. It is undoubtedly the cementing medium of the two 

 portions of the hoof. In some prior observations on the lami- 

 nae made by Mr. Fleming, it will be remembered that he stated 

 that the " microscope, physiology, and pathological experience 

 abundantly testify that the horny leaves are not formed at all 

 by the sensitive ones, and that the coronary ligament secreted 

 he entire wall." How, then, does it happen that the source of 

 this " softer and more elastic white zone " is ascribed to "the 

 secreting villi of the lower end of the sensitive laminae? " If 

 the sensitive laminae have secreting functions at one part, why 

 not at another ? And if not, why not ? If they have not, what 

 need is there of any vascular attachment between the two de- 

 scriptions of laminae, when a merely mechanical one would do 

 as well ? If a portion of the horny wall is not secreted from its 

 sensitive counterpart, perhaps the horny sole and frog are not 

 secreted by their sensitive counterparts; for the inference in 

 one case is just as reasonable as in all three ; and if they are 

 not, from whence are they derived ? Presuming upon the pos- 

 sibility that Mr. Fleming may alight, in the course of his pro- 

 miscuous reading, upon these questions, I shall be expecting an 

 answer to them in some future edition of his work on " Prac- 

 tical Horse-Shoeing " or in some other way. 



THE SENSITIVE FROG. 



This structure presents a double membranous arrangement, 

 similar in this respect to the secreting organs of the sole and 

 wall. Extensions of a dense white fibrous membrane, almost, 

 if not quite, identical with the periosteal tissues before described, 

 completely invest this substance. Its secreting papillae pene- 

 trate the horny frog, just as those of the sensitive sole are im- 

 bedded into the pores of the corneous sole ; but they are said 



