58 



PRACTICAL MICROSCOPY. 



of a reticulum, as shown in Fig. 42. It is not extensively distributed 

 in the human being, although the cartilages of the external ear, Eusta- 

 chian tube, etc., are of this variety. 



Cartilage should be hardened by the chromic acid and alcohol pro- 

 cess. The sections from which the illustrations have been drawn 

 were cut without the microtome. They should be cut extremely thin, 

 not necessarily large. We frequently succeed in getting good fields 

 from the thin edges of sections which may be elsewhere too thick. 

 Stain with haema. and eosin. The differentiation will be excellent. 

 The delicate nutritive channels in the matrix connecting the lacunae 

 may be demonstrated in the cartilage of the sternum of the newt; the 

 xiphoid appendix is sufficiently thin without sectioning. 



BONE. 



Bone consists of an osseous, lamellated matrix, in which occur 

 irregularly shaped cavities la>'unce. The latter are connected by 

 means of exceedingly fine channels canaliculi. The lacunae contain 



FIG. 43. PORTION OF A TRANSVERSK SECTION FROM A DRIED FEMUR SHOWING PART OF THE WAIJU 



OF AN HAVERSIAN SYSTEM. 



A, A. Bony laminee. 



B, B, Lacunse. 



C, C. Canaliculi. X 400. 



