834 Wisconsin Academy of Sciences, Arts, and Letters. 
has its advantages since there are three different nuclei in 
which substitution may take place. 
In naming the derivatives of these compound nuclei a distinc¬ 
tion is sometimes made between hydroxy derivatives of the 
carbocyclic nuclei and the heterocyclic nucleus. The former 
are always regarded as flavones viz. hydroxy flavones, the 
latter, sometimes as flavonols. 
The Pigments referable to diphenyl—1, 3—propene may be 
classified as follows: 
1. The flavone derivatives (in the broader sense.) 
a. ) Dihydroxides, 
Chrysin. 
Tectochrysin. 
b. ) Trihydroxides. 
Apiginin. 
Acaeetin. 
Galangin. 
Galangin methyl ether. 
c. ) Tetrahydroxides. 
Luteolin. 
Luteolin methyl ether. 
Lotoflavin. 
Fisetin. 
Kaempherol. 
Kaempherid. 
d. ) Penthydroxides. 
Quercetin. 
Rhamnetin. 
Isorhamnetin. 
Rhamnazin. 
Morin. 
e. ) Hexhydroxides. 
Myricetin. 
Gossypetin. 
2. Butein. 
3. Anthocyanin pigments. 
a.) Tetrahydroxides. 
Pelargonidin. 
