850 Wisconsin Academy of Sciences, Arts, and Letters. 
frequently met with combined with rhamnose though it often 
combines with other sugars, sometimes forming mixed gluco- 
sides with one or more molecules of rhamnose and one or more 
of another sugar, glucose or galactose. 
As a glucoside quercetin is found in the bark of Quercus tine - 
toria, Q. digitata, or Q. trifida 1 in the bark of Cary a tomentoria, 8 
in grape leaves, 9 Viola tricolor,™ leaves of Eucalyptus macror- 
rhyncha, 11 leaves of Ruta graveolens, 12 buds of Sophora japon- 
ica, 13 leaves of Colpoon compressum , 14 Arctostaphylos uva ursa , 15 
in North American Chimaphila species, 16 in Calluna vulgaris, 11 
in the blossoms of Tagetes patula, 18 in horse chestnut, 19 in the 
leaves and blossoms of Cherianthus cheri 20 and of Crataegus 
oxycanthus 21 in the blossoms of Viola tricolor var. evensis 22 
and in the blossoms of the cotton plant. 23 
In its free state quercetin has been found by Perkin 23 in Rham- 
nus (fruit), Hippophae (berries), Rhus cotinus (bark), Apple 
(bark), Prunus spinosa (blossoms), Aesculus (leaves and flow¬ 
ers), Cornus (flowers), Grape (leaves), Allium cepa, Podophyl¬ 
lum, and the fruit of Rumex obtusifolia 21 It has been found 
by Horst 25 in Polygonum persecaria, by Weiss 26 in Trifolium 
repens, Acacia, Gambircatechu, flowers of Crataegus, and leaves 
of Myrtus checken; by Loewe 27 in Catechu; by Hummel 28 in the 
leaves of Cherianthus cheri; by Pilgrim 29 in the coloring mat¬ 
ter of Delphinium zali; and by Perkin and Wood 30 in the leaves 
7 Ann., 37, p. 101; Monatsh, 5, p. 72. 
8 Am. Jr. Pharm., 51, p. 118. 
0 C. Neubaur, Versuchrt, 16, p. 427. 
10 Jr. Chem. Soc., 71, p. 1131. 
“Jr. Chem. Soc., 73, p. 697. 
12 Ann., 82, p. 197; Apoth. Zeit., (1901 p. 351. 
13 Jr. Chem. Soc., 67, p. 30. 
“Jr. Chem. Soc., 71, p. 1131. 
15 Proc. Chem. Soc., 16, p. 295. 
18 Am. Jr. Fharm., 64, p. 295. 
17 Froc. Chem. Soc., 15, p. 179. 
18 Bull. Soc. Chim., 28, p. 337. 
19 Wien. Acad. Ber., 33, p. 565. 
20 Jr. Chem. Soc., 69, p 1295. 
21 Jr. Chem. Soc., 81, p. 477. 
23 Jr. Chem. Soc., 95, p. 2181. 
23 Proc. Chem. Soc., 19, p. 284 ; Jr. Chem. Soc., 49, p. 1295, 1556. 
24 Jr. Chem. Soc., 71, p. 1194. 
25 Chem. Ztg., 25, p. 2055. 
28 Arch. Pharm., (3) 26, p. 665. 
27 Zeit. f. Anal. Chem., 12, p. 127. 
28 Jr. Chem. Soc., 69, p. 1568. 
29 Jr. Chem. Soc., 73, p. 273. 
39 Jr. Chem. Soc., 73, p. 381. 
