93 PRACTICAL HISTOLOGY. 



spirit, at once in glycerine. It is immediately seen 

 that the cartilage above the line of demarcation 

 merely differs from that below by the superaddition 

 of a network of comparatively coarse branching 

 (elastic) fibres. Just at the junction of the two 

 parts the fibres are but few in number, and at their 

 ends often imperfect i. e., they may appear continued 

 merely as rows of granules as if not yet fully formed. 

 Further into the yellowish part they permeate the 

 matrix very thickly, and give it almost a granular 

 appearance, owing to many of them being seen in 

 section. But immediately around each cell there is 

 always a larger or smaller area of the matrix entirely 

 free from fibres, and this area is in appearance ex- 

 actly like the matrix of hyaline cartilage. So that 

 we may conclude that yellow or elastic cartilage is 

 merely to be regarded as hyaline cartilage, in the 

 matrix of which a deposit of elastic substance has 

 taken place in the form of branching fibres; and, 

 indeed, the study of its development shows this to 

 be the case. 



Preparation 11. Yellow fibre-cartilage. A 

 tissue may now be studied which is composed en- 

 tirely of yellow cartilage, the human epiglottis or 

 external ear, for example. A section of either of 

 these shows what at first looks like a granular 

 matrix dotted with islands of hyaline substance, 

 each with one or two cartilage-cells in the centre. 

 The granular appearance of the matrix, when care- 

 fully observed, is seen to be due to an excessively 

 close feltwork of fine elastic fibres; in fact, the 

 structure is quite like that of the upper part of the 

 ox's arytenoid, although, owing to their fineness and 

 closeness, the individual fibres cannot be followed 

 for any distance. 



Preparation 12. White fibro-cartilage is best 

 studied in sections of any ligament which is com- 

 posed of this tissue, or of the insertion of any tendon 

 or ligament which is attached, as in the young sub- 

 ject many are, to cartilage. The tissue may have 



