252 



CONNECTIVE TISSUE. 



aeter of many places, one of which I have illustrated, forces us to the conclu- 

 sion that not only the cartilage corpuscles, but the whole mass of living 

 matter stored up in the basis-substance of the cartilage, participates in the 

 formation of medulla. No other interpretation is admissible, for a sudden 

 transition of an apparently structureless basis-substance into a protoplasmic 



FIG. 103. ARTICULAR CARTILAGE OF A YOUNG CHICKEN. 

 SECTION. CHROMIC ACID SPECIMEN. 



SAGITTAL 



O, hyaline cartilage; CB, calcified basis-substance of hyaline cartilage; M, medullary 

 space; B, trabecuUe of newly formed bone. Magnified 450 diameters. 



mass takes place without a trace of an intervening division of the cartilage 

 corpuscles. (See Fig. 104.) 



At the border where the cartilaginous basis-substance is dissolved, we not 

 infrequently meet with cartilage corpuscles, partly imbedded in the basis- 

 substance, partly freely projecting into the previously formed medullary 

 space, but I never saw marks of division of such corpuscles. Instead of 



