e 
fi 
SOME CONTRIBUTIONS TO PLANT-CHEMISTRY. 365 
Thus the total ash in the dry ash-flowers amounted to 8 per cent., 
which fhe honk when its constituents are calculated as per- 
centage 
Lime . ; ; ‘ : ; ; 4 13°22 
Potash ; ‘ ‘ ‘. 39°42 
Phosphorus pentoxide ; 28°98 
Silica, aco ws Soe trioxide, &e., un- 
determined . : 18°38 
On comparing these numbers with those obtained in the A 
of the female flowers of the Elm (Journ. of oe v. 73) it will be 
seen that the more valuable elements of plan -nutrition are alike 
abundant in both cases, although the present scuarphl | a still more 
striking one than that of the Elm. The contrast in seckevoniiin between 
shown in the following manner, os ieee analysed being assumed 
to be perfectly dry in both ca 
Ash -aitageobes contain 7°4 times as much seal ag as Beech scales. 
9? Led i 7 ”? 2? pot ”? 
we og AN ers ore ae pentoxide ,, 
In the account of Elm-flowers previously given in this Journal 
(loc. cit., p. 73) an error of calculation occurred. e ash of Elm- 
tuents being 3°93. 
5. Acer Negundo. A variegated form of this tree was studied t 
witisthec chemical analysis would throw any light upon the see 
which determine or maintain the white variegation of certain plants, 
en 
leaves or part of leaves were similarly treated. Such determina- 
tions of their differences as have been made are here shown. 
Per-centage of White parts. Green parts, 
Water 82°83 72:70 
era matter 15°15 24:22 
