784 Wisconsin Academy of Sciences , Arts, and Letters. 
Hydroquinone also exists as the mono methyl ether in the oil 
of star anise. Illicium verum f a member of the family Mag- 
noliaceae. 1 
Pigments referable to dihydrotoluene 
Dihydrotoluene Methyl benzoquinone 
As has been pointed out in connection with quinone, methyl 
hydroquinone exists potentially in Gaultheria procumbens and 
other species of the Ericaceae as the glucoside methyl arbutin. 
The same possibilities for forming pigments by hydrolysis, oxi¬ 
dation, and addition exist in both quinone and methyl quinone. 
Pigments referable to dihydrocymene 
ch 3 
c 
C Dihydroxythymoquinone 
ch 3 ch 3 
Monohydroxythymoquinones 
1 For references see under Hydroquinone, formula of saturation Cn H 2 n- a 
