902 Wisconsin Academy of Sciences, Arts, and Letters. 
III. PIGMENTS REFERABLE TO HYDROCARBONS OF THE CONFIGURA¬ 
TION SEVEN DOUBLE BONDS AND THREE CYCLES. 
Pigments referable to phenyl- dihydronaphthalene . 
One pigment apparently a derivative of the above hydrocarbon 
has been isolated from plants. This is trifolitin, probably a 
tetrahydroxy derivative of phenyl-naphthaquinone. 
O 
PhenyPnaphthaqulnone 
Trifoletin was first isolated by Power and Solway, 1 in 1910, 
from the flowers of red clover, Trifolium pratense. Trifolitin, 
which crystallizes in yellow crystals, is apparently a tetrahy¬ 
droxy derivative of phenyl-naphthaquinone. It is readily 
soluble in alcohol and glacial acetic acid, sparingly soluble in 
chloroform, ether, and benzene. In alkaline solutions it dis¬ 
solves with a bright yellow color, in sulphuric acid with a yel¬ 
low color. It dyes mordanted cotton a bright yellow. 
1 Jr. Chem, Soc.» 97, 241. 
