ii2 PRACTICAL HISTOLOGY. 



TRANSVERSE SECTION OF THE NOSE. 



The student ought to have a section through the whole nasal chamber in order to study 

 the respiratory mucous membrane, nasal septum, the turbinated bones, and the general 

 arrangement and comparative vascularity of the parts. 



PREPARATION. Inject the blood-vessels of the head of a rabbit or guinea-pig with a 

 carmine-gelatine mass from the aorta. Open the skull, and remove the brain ; disarticulate 

 the lower jaw, and cut off the head. Place it in Muller's fluid for three or four days, and then 

 in the chromic acid and spirit mixture for the same time. This fixes the various elements. 

 Place it in the chromic acid and nitric acid mixture, until the bones are completely decalcified. 

 Make sections across the entire nasal chamber in a freezing microtome. Doubly stain them 

 with logwood and iodine-green, and mount them in dammar. These form most instructive 

 preparations. 



