BONE-CORPUSCLES. 



109 



rately high power we discover that these vessels (Fig. 

 32, a) immediately beneath the surface form a network 

 with somewhat long meshes, or a series of tubes anasto- 

 mosing with one another and, generally speaking, run- 

 ning longitudinally, for though they sometimes take a 

 somewhat more oblique course inwardly, they still 

 essentially maintain a longitudinal direction. Between 

 these meshes there remain comparatively wide inter- 

 spaces, within which, precisely as we before saw the 

 cartilage cells, we here see the bone-corpuscles, and 

 indeed also in a longitudinal direction, parallel to the 

 surface. If the same part be examined in transverse 

 section, we of course see, where the longitudinal canals 

 were previously observed, nothing but their transverse 

 sections here and there united by oblique communica- 

 tions ! Between them lies the proper osseous tissue, 

 deposited in lamellar layers, some of them parallel to 



FIG. 33. 



the surface, some concentrically arranged around the 

 vessels. In the deeper layers of the compact substance 



Fig. 33. Section of bone. a. Transverse section of medullary (vascular [Haver- 

 sian]) canal, around which the concentric lamellae, /, lie with bone-corpuscles and 

 anastomosing canaliculi. r. Lamellae divided longitudinally and parallel, i. Irre- 

 gular arrangement in the oldest layers of bone. v. Vascular canal. 280 diameters. 



