MUCOUS TISSUE. CARTILACJK. 37 



Mucous tissue. Umbilical cord, man. T.S. (p. 12, c. G., s. 19, 

 m. F.) (L) The section is rounded ; in it observe three circular 

 structures, two arteries and a vein surrounded by connective 

 tissues of an open texture. (//) In the latter are found branch- 

 ing cells with delicate irregular processes lying in a transparent 

 matrix (mucinous substance) which exhibits a good deal of 

 fibrillation in its later stages of growth. 



Cartilage. Hyaline cartilage. Young costal, (p. 2 (rf), c. G., 

 s. 19, m. F.) (L) Externally there is the fibrous perichondrium 

 inside this the substance consists of matrix, apparently struc- 

 tureless, in which the cartilage cell-spaces, irregularly fusi- 

 form in shape, are distributed. In the hardened specimen the 

 cells do not always completely fill the spaces in which they 

 lie, as they are usually somewhat shrunken. Towards the 

 periphery, close to the perichondrium, the spaces often com- 

 municate with each other. In the interior the older capsules 

 do not show these connections. The transition of the connective 

 tissue cells of the perichondrium into those of the cartilage 

 should be noted. 



Cartilage o/ cuttlefish, (p. 2 (d), c. G., s. 19, m. F.) (Jf) The cell 

 spaces occur in clusters, and from these fine branching channels 

 run outwards to communicate with other groups and establish 

 direct communications with their spaces. 



Adult costal cartilage Human. (p. 2 (d), c. G., s. 19, m. F.) 

 The cells are in clusters immediately around which the matrix 

 is hyaline, outside this fibrillated, arid in the aged and 

 unsoftened tissue contains lime salts. 



Articular cartilage. V.S. (p. 2 (d), c. G., s. 19, m. F.) The film 

 of cartilage which covers the articulars end of bones is hyaline. 

 Near the free surface the cells are flattened, deeper down they 

 are oval. The matrix close to the subjacent bone is fibrillated 



