VOLATILE OILS AM) h'LSl.XS 



85 



and carvacrolj isomeric phenols. The former is obtained 

 from thyme oil, and is used as an antiseptic. It is a crystal- 

 line solid. The other constituents of thyme oil are esters, 



Fig. 21. — The proper way to collect crude turpentine. Forest Service. 

 United States Department of Agriculture. 



hydrocarbons, etc. Thyme oil is yellowish-red when impure, 

 due to action of the phenols on the iron stills; and light 

 yellow when pure. It is lighter than water; used in medi- 



