816 Wisconsin Academy of Sciences, Arts, and Letters. 
HC 
HOC 1 
and protocatechuic acid being obtained as the products of hy¬ 
drolysis. 
The principal literature upon kinoin is given in the appended 
list. 
Literature upon kinoin. 
Bergholz, Innaug. Dissert. Dorpat.; B., 5, p. 1. 
Eissfeldt,—Ann., 134, p. 122. 
Etti,—B., 11, p. 1879; 17, p. 2241. 
Flueckiger,—B., 17, p. 2241. 
Hlasiwetz,—Ann., 134, p. 122. 
Kremler,-—Pharm. Post., 16, p. 117. 
White,—Pharm. Jr., 16, p. 676; 17, p. 702. 
Gentisein, — Trihydroxy—1, 3, 2'—diphenyl methanone oxide, 
or trihylroxy—, 1, 3, 2 f — xanthone. 
Gentisein 
Gentisein occurs as its methyl ether gentisin in the rhizome 
of Gentiana 1 lutea, also in the rhizome of Frasera Walteri. Gen¬ 
tisin was first isolated from the rhizome of Gentiana lutea in 
1827 by Henry and Caventon. It was studied by Tromsdorff 2 
in 1837 and by La Conte 3 in 1838. La Conte in his study points 
out the fact that the gentian plant from which the pigment is 
obtained, derives its name, according to Pliny, from the Illyrian 
king Gentis, or Gentius, who appears to have valued the root 
very highly as a remedy for certain illnesses epidemic in his 
time. In 1847 Baumert 4 made an extended study of gentisin 
1 Jr. de Pharm., (2) 7, p. 125. 
2 Am. Jr. Pharm., 52, 7. 
3 Jr. Pharm., (2) 7, p. 178. 
4 Ann., 21, p. 134. 
