148 



PRACTICAL HISTOLOGY. 



[VIII. 



As a general rule, it may be stated that gold chloride stains the 

 cellular elements, whilst silver nitrate stains the cement substance, 

 e.g., connective tissue, cornea, &c. 



5. Costal or Tracheal Cartilage (L and H). With a razor make 

 a thin transverse section of a fresh rib cartilage or tracheal cartilage, 

 e.g., of a dog, cat, or rabbit, and examine the section in normal 

 saline. 



(a.) (L) Observe the circular or oval outline of the section 

 surrounded by the perichondrium firmly adherent to the cartilage, 

 which consists of cells embedded in a hyaline matrix (fig. 1 1 1, Pch). 



Chb 



FIG. in. Hyaline Cartilage. T.S. Human thyroid hardened in alcohol, x. Fibrous 

 matrix ; Chb. Cartilage-capsules ; Pch. Perichondrium. 



(ft.) (H) Observe that the cells are smaller and flattened near the 

 periphery, fusiform farther in, oval or spherical nearer the centre of 

 the section. They may lie singly, or in groups, or in rows. 



(c.) The matrix is generally hyaline, but in some places it may 

 be fibrous (figs, in, x, and ii2,/). 



(d.) Around each cell, or, it may be, each group of cells (fig. 112, 

 3 or 2), look for a cartilatje-capsule (fig. in). It is firmly united 

 to and continuous with the matrix ; but by tilting the mirror 

 slightly, so as to modify the light, it may be seen distinctly as a 



