CH. V.] 



CARTILAGE 



53 



Each cell deposits on its exterior a sheath or capsule ; on division 

 each of the daughter-cells deposits a new capsule within this, and 

 the process may be repeated (see fig. 81). 



Thus the cells get more and more separated. The fused capsules 

 form a very large part of the matrix, and indications of their previous 

 existence may sometimes be seen in fully formed cartilage by the 

 presence of faint concentric lines around the cells (see fig. 77). 



In a variety of cartilage found in the ears of rats and mice called 



iiiiiiiiiiiiiiiiiiiiiiiiilililliiiiiiiiniiiiiiiiiiniiiiininiiiiini 



FIG. 81. Plan of multiplication of cells in cartilage. a, Cell in its capsule ; b, divided into two, 

 each with a capsule ; c, primary capsule disappeared, secondary capsules coherent with matrix ; 

 d, tertiary division ; e, secondary capsules disappeared, tertiary coherent with matrix. 

 (After Sharpey.) 



cellular cartilage, the cells never multiply to any great extent, and 

 they are only separated by their thickened capsules. 



But in most cartilages the cell-capsules will not explain the 

 origin of the whole matrix, but intercellular material accumulates 

 outside the capsules and still further separates the cells. 



By certain methods of double staining, this twofold manner 

 of formation may be shown very markedly. We have seen that 

 chondrin obtained by boiling cartilage is really a mixture of two 

 substances; one is a mucinoid material, and comes from the 

 capsules ; the other is gelatin, which comes from the rest of the 

 ground-substance which is collagenous. In hyaline cartilage, how- 

 ever, the collagen does not become precipitated to form fibres, but in 



