70 



STUDENTS HISTOLOGY 



extremely thin, but not necessarily large. We frequently succeed 

 in getting good fields from the thin edges of sections which may 

 be elsewhere too thick. Stain with hasmatoxylhi and eosin. The 

 differentiation will be excellent. The delicate nutritive channels 

 in the matrix connecting the lacunae may be demonstrated in the 

 cartilage of the sternum of the newt ; the xiphoid appendix is 

 sufficiently thin without sectioning. 



FIG. 46. TRANSVERSE SECTION OP PORTION OP A DRIED LONG BONE, SHOWING THE 



HAVERSIAN SYSTEMS. 



A, A, A. A Haversian system. 



B. Haversian canal. 



The lacunas, canaliculi, and Haversian canals all appear black in the section, as they are 

 filled with air and the bony fragments resulting from grinding of the section (X60). 



BONE 



Bone consists of an osseous, lamellated matrix, in which occur 

 irregularly - shaped cavities lacunae. The latter are connected by 

 means of exceedingly fine channels canaliculi. The lacunaB con- 

 tain the bone -corpuscles, the bodies of which are projected into 

 the canaliculi. 



