256 BOTANICAL GAZETTE [SEPTEMBER 
The bibliography is very complete and should stimulate further work. Brief 
reviews of the anthocyan pigments have pegged appeared by Artxins; 
Pveaesr, 9 encsamnrede SRI and WEst.” 
ti ithe ugar-free compound, obtained 
pon hy of th anthocyan with 20 per cent hydrochloric acid) has 
He definitely established by the synthesis of cyanidin (by the reduction of 
rectness of the formulas earlier proposed fy by sdeoevelien after studying the 
orides. The mechan- 
ism of the reduction of quercetin and other flavones to anthocyanidins has 
béen questioned by certain Japanese workers,’ who claim to have isolated 
various magnesium compounds as intermediate products. These criticisms, 
Bonever, 3 in no way invalidate the general conclusion as to the structure of the 
anthocyanidins. 
me | Cl 
0 O OH 
wii Bee 
Sas 
HO 
Cyanidin chloride 
HO; oH. 
_ S Argmys, W. R. G., Research hysiology. Whittaker Co. 16 
a 9 Everest, A. E., Science Progress i507. 914-153 eg Genetics 4 es a 
TOHETS. : es 
_® WHELDALE we 1 red Cua Se ue 
as: a. : Pog r ae a 
