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 Stcrculia 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 CEnothera Jaquinii 

 and of Kadzura japonica contain galactan and araban. 



