Note 62 — DISSERTATION II. CONTINUED. (continued 2)

In the description of this variety, it was mentioned, that there frequently was a small opening in the surface, which communicated with the bone; but, even where this is not the case, the layer of dead bone, when it exfoliates, comes through the granulations; for the granulations of the sound bone below raise it up, in consequence of which, pressure is made from within outward upon the ulcer, by which absorption is produced at that part, in a greater degree than deposition; and, therefore, a vacuity is produced.