30 CLEARING AGENTS. 



Oil of Origanum and Oil of Sandal Wood. 



These are both to be recommended as clearing agents, but for 

 many tissues are not wholly satisfactory. 



Turpentine. 



Turpentine is much used for clearing paraffine sections, as it 

 dissolves out the paraffine and clears the sections at the same time. 

 It is very liable, however, to cause sections cut in alcohol or 

 collodion to shrink. 



Carbolic Acid and Turpentine. 



This is to be recommended as the cheapest and at the same 

 time the most satisfactory of all clearing agents. 



The mixture is made of 3 parts of turpentine and 2 of pure 

 carbolic acid. It clears equally well paraffine, collodion, or alco- 

 holic sections, and needs but a few minutes to thoroughly permeate 

 the tissue. It is best to filter the mixture through cotton to remove 

 all particles of dust. The carbolic acid gives the hands an unpleas- 

 ant feeling and they should therefore be kept free from it. 



