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THE CONNECTIVE TISSUES, BY A. ROLLETT. 



dinal section, if it contains all the parts undergoing change from 

 the still unaltered cartilage to completely formed bone, are the 

 following (fig. 12). Immediately below the cartilage exhibiting 

 the characters of foetal cartilage, as it appears previously to 



Fig. 12.' 



Fig. 12. Longitudinal section carried through the line of ossification 

 of a tubular bone. From a human embryo. 



ossification, there follows a layer of cartilage (a) in which the 

 cells lie more closely compressed together, and present a 

 definite arrangement. They form longitudinal rows. In these 

 rows the cells appear as plates flattened in the direction 



