Dec. 2o, 1915 
Mineral Composition of Sap , Leaves , and Stems 
533 
strates the large amount of potassium oxid in the sap at the end of the 
sap flow compared with the beginning, since the sodium oxid is fairly con¬ 
stant during both years. See Table VI. 
Table VI .—Comparison of the ratios of calcium oxid to magnesium oxid and potassium 
oxid to sodium oxid in sap of wild grape taken from the same point on the vine at different 
times during the same season 
Sample No. 
Ratio of 
calcium 
oxid to 
magnesium 
oxid. 
Ratio of 
potassium 
oxid to so¬ 
dium oxid. 
8C2. 
6. 7 : i 
6. 1 : 1 
• 5 - 9 :i 
4. 2 : i 
21. 3 : 1 
16. 7 : 1 
28. 7 : 1 
900... 
902. 
An examination of the minimum and maximum percentages of the 
minerals in the sap collected at the same point during four successive 
years and just after the sap flow commenced shows the largest variations 
which have been found (Table VII). The constituents vary in order of 
magnitude as follows: Potassium, chlorin, iron, aluminum/silica, phos¬ 
phorus, sulphur, magnesium, sodium, and calcium. Again there is a 
wide variation in the ash content of the different samples (Table VIII). 
Table VII. —Variation in percentage composition of fresh sap collected at the same 
point on the wild-grape vine at the beginning of the sap flow during four successive 
years 
Constituent. 
Sample 
No. 285. 
Sample 
No. 812. 
Sample 
No. 852. 
Sample 
No. 900. 
Ratio be¬ 
tween mini¬ 
mum and 
maximum. 
Water at ioo° C. 
99. 6340 
99. 8665 
99.8279 
99. 8183 
1 : 1. 00 
Organic matter. 
. 2782 
.0917 
• r 43 S 
• 1305 
1 : 3 - 03 
Silica (Si 0 2 ). 
. 0005 
. 0005 
. OOOI 
. 0003 
1 : 5. 00 
Ferric and aluminic oxids (Fe,O a 
+ai 2 o 3 ). 
. 0006 
. 0002 
. OOOI 
. OOOI 
1 : 6. 00 
Calcium oxid (CaO). 
. 0220 
. 0206 
. 0160 
. 0234 
1 : 1. 46 
Magnesium oxid (MgO). 
. OO44 
.OO43 
. 0024 
. 0041 
1 : 1. 83 
Sodium oxid (Na 2 0 ). 
. OOI7 
. OOl6 
. 0012 
. 0010 
1 : 1. 70 
Potassium oxid (K 2 0 ). 
. 0468 
. 0112 
. OO5O 
. 0167 
1 : 9. 36 
Phosphorus pentoxid (P a 0 6 )___ 
. OO58 
. OOI7 
■ 0015 
. 0030 
1 : 3. 87 
Sulphur trioxid (S0 3 ). 
. OO52 
. OOl6 
. OOI9 
.0025 
1 : 3. 25 
Chlorin. 
. 0008 
. OOOI 
. 0004 
. OOOI 
1 : 8. 00 
Total . 
100. 0000 
IOO. OOOO 
IOO. 0000 
IOO OOOO 
25 0 . 
1-0035 
I. OOO67 
I. 0009 
I. 00082 
1 : 1. 00 
Nitrogen as nitrates . 
.0075 
. OOO48 
. 0013 
. 00004 
1 : 187. 50 
Crude ash . 
• 1130 
.O57O 
• 0384 
. 07000 
1 : 2. 94 
