414 BOTANICAL GAZETTE | DECEMBER 
was refiltered and again dried and weighed. The weight of 
KCI + NaCl being known, the KCl was removed with PtCl,, the 
K determined, and the amount of Na found by subtraction. 
The statistical results are embodied in the accompanying 
table, compiled according ,to Meyer and Seubert’s atomic 
weights. 
KCl+ NaCl KCl NaCl K+Na 
oe 
z 3 MT 0 ene — 
wei | | me [Ber] ow | Fier” | er 
lence 
PHASEOLUS: ore 
K Stem .| 20° | 0.1872] 0.935 | 0.7078 | 0.0931 | 0.2277 | 0.0391 | 0.1342 
Root .| 16 0.0777 | 0.4856 | 0.3731 | 0.0504 | 0.1125 | 0.0193 | 0.0697 
Na Stem .| 12.5 0.0421 | 0.3368 | 0.2184 | 0.0294 | 0.1184 | 0.0203 | 0.0497 
Root . 16 0.072 0.450 0.1038 | 0.0138 | 0.3462 | 0.0593 | 9.0731 
Kk { Stem.}| 20° 0.159 ®| 0.795 | 0.6064 | 0.0815 | 0.1785 | 0.0306 | 0.1121 
| Root .| 20 0.109 | 0.545 | 0.4005 | 0.0538 | 0.1445 | 0.0248 | 0.0786 
<a } Stem .| 10 0.0206 | 0.206 | 0.0828 | o.o111 | 0.1232 | 0.0211 | 0.0322 
Root . 38 | 0.010 | 0.263 | 0.1187 | 0.0160 | 0.1445 | 0.0248 | 0.0840 
The weight per cent. of K and Na was calculated, but is 
omitted from the table. Comparison with v.Wolff’s analyses” 
makes it appear probable that both elements are more abundant 
in the cell-sap than in the plant as a whole. Still this appear- 
ance may be due entirely to different conditions of growth. In 
the table, K and Na are represented in the form of chlorides 
merely for the sake of convenience, since analysis yielded them 
inthat form. As both K and Na were present to some extent in all 
the sap analyzed, the sum of the two is the most suitable character 
by which to compare the cultures. This sum, of course, should be 
measured, not by the percentage weight, but by the gram-mole- 
cule (the equivalence). Multiplying the figures in the last 
vertical column by ten will give very nearly the osmotic power 
of the several mixtures of K and Na salts, measured in pet — 
— of KNO,. : ‘ 
~The « Bi aes ene hee, eae re : f sabe of ‘kK and Na between 
the stems of Phaseolus grown | in 1 the at and those in the Na-_ 
2 ‘Condensed in Ad. Mayer: Ernithr der an > 307 Heidelberg, 
1895. 
