806 Wisconsin Academy of Sciences , Arts, and Letters. 
Pigments referable to methyl 2 , butylene 2, dihydro naphtha¬ 
lene. 
dihydro naphthalene 
A hydroxy amylene naphthaquinone, lapachol, yellow in 
color, has been found in the lapacho 3 ) wood, obtained from 
several species of South American Bignoniaceae, in the green 
heart of Surinam 4 ) and in Bethabarra wood. 5 ) 
Upon reduction with sodium, lapachol yields an unstable hy- 
drolapachol. The metallic derivatives of lapachol are of var¬ 
ious shades of red and orange red. 
Pigments referable to methyl 2, butylene 3 , dihydro naphtha¬ 
lene. 
A yellow compound, lomatiol, 6 ) hydroxy lapachol or oxyiso- 
lapachol, has been isolated from the seeds of Lomatia ilicifolia 
and Lomatia longifolia. 
The metallic derivatives of lomatiol are red, orange or brown 
in color. 
8 Jahresb. u. d. Fortsch. d. Chem., (1858) p. 264. 
4 Ztsch. f. Chem., (1867) p. 92. 
s Am. Chem., Jr., 11, p. 267. 
8 Jr. Chem. Soc., 67, 784. 
