340 Wisconsin Academy of Sciences, Arts, and Letters. 
which means fusible, because its melting point is much lower 
than that of ehrysin. Tectochrysin may be prepared synthe¬ 
tically by treating ehrysin in alcoholic solution with methyl 
iodide. It is more readily soluble than ehrysin, being easily 
soluble in benzine (distinction from ehrysin.) Tectochrysin is 
sulphur yellow in color. 
Trihydroxy fiavones 
Apigenin, — Trihydroxy — 1, 3, 4' — flavone. 
The glucoside apiin, of which apiginin is a component, seems 
to have been first isolated by Rump 1 in the course of his work 
on the chemical analysis of Apium petroselinum, but it was not 
until 1843 that Braconnot 2 first hydrolised this glucoside. 
Braconnot also applied the name apiin to the glucoside but 
made no analysis of the products of hydrolysis. In 1850 Planta 
and Williams 3 analysed apigenin and described it under the 
name of pure apiin. In 1867, Lindenhorn 4 showed the glu- 
cosidal character of apiin, and that by hydrolysis it gave glucose 
and a new substance to which he gave the name apigenin. 
Gerichten, 5 in 1876, took up the study of the constitution of 
apigenin, basing his conclusions upon its decomposition in the 
presence of alkalies. He ascribed to apigenin the formula 
C 15 H 10 O 5 , a formula which has since been verified by the work 
of Perkin, 6 and more recently by that of Kostanecki and - 
Tambor. 7 
Apigenin occurs as the glucoside apiin in Petroselinum 
1 Rep. f. Fharm., 6, p. 6. 
2 Ann. d. Phys. et Chim., 9, p. 250. 
8 Ber., 9, p. 112. 
4 Innaug. Dissert. Wuerzburg, 1867. 
c Ber., 9, p. 259, 1121, 1477. 
6 Jr. Chem. Soc., 71, p. 807; 77, p. 420. 
7 Ber., 33, p. 1990. 
