LESSON IX. 



HYALINE CARTILAGE. 



1. Snip off a piece of the free edge of any of the 

 thin cartilages projecting from the sternum or shoulder- 

 girdle of a freshly killed young newt 1 . Gently scrape 

 away with a scalpel any tissue attached to it. 



a. Mount it in 0'6 or 0*75 p.c. sodium chloride 

 solution' 2 and with a high power note that 



The matrix is studded at tolerably regular intervals 

 with cartilage cells or corpuscles. 



Each corpuscle consists of a spherical or ovoid mass 

 of cell substance, in which lies a relatively large 

 nucleus. Both of these are fairly clear and trans- 

 parent. Most of the cells entirely fill up the cavities 

 in which they lie. Along the cut edge some cavities 



1 As newts are not always obtainable in sufficient number for the 

 method given here, the fresh cartilage may be cut frozen (Less. vn. 

 4), and the sections given out ; or similar sections may be given out 

 of the hyaline cartilage on the head of a long bone of any young 

 animal. In such sections there will be a good many cavities out of 

 which the cells have fallen. 



2 See note below. 



