BOXE. 



Ossified cartilage is found on the articular ends of adult bones, lying 

 underneath the natural cartilage of the joint, both in the moveable articu- 



Fig. XLYIIT. 



Fig. XLVIII. PORTION OP A NOLULATED LATER OP BONE-TISSUE PROM NEAR THK 



SURFACE OP THE SHAFT OF A DKCALCIFIED IlUMKRUS. 



At one side shreds of fibrous lamellae are seen in the figure. 



diameters. 



Magnified 300 



lations and in symphyses, and is in fact the deeper part of the cartilage 

 which has been encroached upon by the calcifying process. The animal 

 basis is here, however, of a totally different nature from that of the bone 



crusta petrosa which is contiguous to the dentine or to the enamel, is marked over with 

 spheroidal bodies having, in decalcified specimens, very much the appearance represented 

 in Fig. LXVI1I., but most of them with one or more lacuna-like cavities within. They 

 look very like distinct globules, and have been described by Czermak as calcified cells 

 containing lacunae ; but on carefully viewing the decalcified layer in profile-sections and 

 otherwise, I am led to the conclusion that they are mammillary elevations of the surface, 

 continuous by their (sometimes contracted) bases with the general substance. The enamel 

 is destroyed in the decalcification, but the surface of the dentipe. of the ccrvi* and \foot 

 from which the inammillated layer of c*u&ta<; p^tfasa has, hem, detached,* i^fciundJtb" be 

 excavated in a manner to correspond with it f ; e ^ juTangerapnS ^ell calculated 'iV secure 

 their mutual connection. , , -, .,->, " 



