208 
YOSHIMURA ; COMPOSITION OF MUCILAGES. 
Another portion was examined with phloroglucin and 
hydrochloric acid for the presence of pentoses. And, finally, the 
osazones were made in the usual manner and, after purification 
by recrystallization from dilute alcohol, their melting points were 
determined. In this manner, I was enabled to come to the con¬ 
clusion that the mucilage of Sterculia platanifolia consists of a 
mixture of araban with some galactan, and that of Colocasia 
antiquorum , since it gave neither mucic acid nor the pentose or 
mannose reaction, but an osazone which was proved to be 
identical with phenylglucosazone, consists probably only of a 
polyanhydride of d-glucose. 
The mucilage of Vitis pentaphylla , as well as that of Opuntia , 
consists principally of galactan, while those of Œnothera Jaquinii 
and of K ad zur a japonic a contain galactan and araban. 
