Xl] ELASTIC CARTILAGE. BONE. TEETH 91 



results. After a fortnight the decalcification may be quickened 

 by adding nitric acid up to 1 p.c. 



Chromic acid. The tissue is placed in '2 p.c. chromic acid for 

 about two days, then in *5 p.c. and this must be renewed several 

 times. The final stages may be hastened by adding to the 

 chromic acid, nitric acid up to 1 to 2 p.c. ; or by using Perenyi's 

 fluid (cp. p. 299). 



