12 Prof. W. N. Hartley and A. K. Huntington. 



preceding specimen. When diluted 2,000, 4,000, and 5,000 times it 

 exhibited absorption bands coinciding with those shown in No. L 

 These bands are noticeable in the carraway hydrocarbon. 



Diageah 10. 



The following specimens of essential oils and hydrocarbons prepared 

 therefrom all exhibit absorption bands. 



Thyme hydrocarbon. Oil of bergamot. 



Lemon ,, Myristicol. 



Nutmeg „ Oil of cloves. 



Oil of bay. Oil of aniseed. 



Otto of pimento. Carvol. 



Oil of thyme. Oil of cassia. 

 Oil of peppermint. 



In the case of the hydrocarbon from thyme, lemon, and nutmeg, it 

 is the presence of cymene which causes an intermediate absorption in 



