906 Wisconsin Academy of Sciences, Arts, and Letters. 
COH 
C 6 H 2 (OH) : 
,/ n , 
\,„/ 
'COH 
QH3CH3 c 6 h 2 (oh) 2 ; 
CH 
L 
\™/ 
CH 
J 
Dichrysarobin is a partial dehydration product of octahydroxy 
di (methyldihydroanthracyl). 
Dichrysarobin 1 and the methyl ether of dichrysarobin occur 
along with chrysarobin in goa powder obtained from Andira 
araroba. 2 
Dichrysarobin crystallizes in orange colored tabular crystals 
which are soluble in ethyl acetate and acetic acid but insoluble in 
benzene (distinction from chrysarobin) it is more readily oxi¬ 
dized to chrysophanic acid, in alkaline solution than chrysarobin. 
note. The writer wishes to acknowledge her indebtedness to 
Mills College, the woods and gardens of which were generously 
opened to her for the collection of plant material. She also 
desires to extend thanks to her colleagues at Wisconsin, who have 
freely criticised her work, especially to Professor E. R. Miller, 
who has kindly placed at her disposal the results of his obser¬ 
vations along this line, and to Professor L. R. Ingersoll of the 
Department of Physics, who read and criticised part of the 
introductory chapter. Above all she wishes to express her 
gratitude to Professor Edward Kremers, who first introduced 
her to the study of plant pigments, and whose enthusiastic in¬ 
terest and patient supervision have been her inspiration and 
guide. 
1 Jr. Chem. Soe., 81, p. 1575. 
* B., 11, p. 1603; Ann., 309, p. 32. 
