a eee 
. „ Under the apetalous and monocotyledonous groups volt, 
among the monocotyledons, the palms occur on the same plat, 
eight hundred pounds of sago having been obtained from onè 
ge . he s 
contain this substance most abundantly, —namely, the 
It is certainly true that some tannins play a distinct rôle as the 
source of many vegetable colors, —the reds and blues of flowers, 
the brown of tree-barks, and the colors of changing leaves on 
their origin to this source. ; ži 
The large quantity of starch in most tannin plants is remarke 
able, and Sachs believes it, or fixed oils, to be the mother-sub- ; 
stance of tannin. es 
Datiscin,? a kind of starch, is found in the Datisca order, and, 
ms 
vee Le 
À 
and in most of their genera contain large quantities of starch, 
k 
the latter plants, 12.5 per cent. from Typha latifolia (Lecoq). 2 
--Large quantities of wax are found in species of the myrte, 
and also of the palm. a 
On the second plane, or multiplicity of floral parts, the chit 
ical constituents become much more numerous at this stag® 
danus (screw-pine) and bulrush orders yield much starch; o% 
plant of Metroxylon, or the sago-palm species. The Arum pat- 4 
: 
tain the tannins of the lower apetalous plants and ifs parallel 
beet, sugar-cane, sorghum, the fruit groups of the Rosace®, 
the sugar-maple. ae, 
_ The sugar of the palms, among the highest of plants 
simplicity of floral elements, is very like that of the cam® | 
the grasses are the lower of monocotyledons with mu ee 
of parts, it is notable that at the meeting-ground betwee? = 
groups, or at the transition-stage into multiplicity, sugar * 
_* According to Stenhouse, datiscin is a crystalline glucosidal bitter substance 
