Dec. 20, 1915 
Mineral Composition of Sap, Leaves, and Stems 
53 1 
Table II .—Percentage composition of ash of the samples in Table I 
Constituent. 
Sample 
No. 852. 
Sample 
No. 853. 
Sample 
No. 900. 
Sample 
No. 901. 
Ratio between— 
Nos. 852 
and 853. 
Nos. 900 
and 901. 
Silica (Si 0 2 ) .. 
0.339 
0. 231 
0.485 
2. 5 °S 
i : 0. 68 
1 : 5 * 16 
Ferric and aluminic oxids 
(Fe 2 0 3 +Al 2 0 3 ). 
. 261 
. 210 
.143 
• 574 
1 : .80 
1 : 4.01 
Calcium oxid (CaO). 
41. 628 
32. 535 
33 * 432 
40.386 
1 : .78 
1 :1. 21 
Magnesium oxid (MgO). 
6.364 
5.296 
5.828 
9. 424 
1 : .83 
1 : 1. 62 
Sodium oxid (Na 2 0 ) .. 
3 - 234 
2.522 
1-483 
i- 633 
1 : .78 
1 : 1.10 
Potassium oxid (K 2 0 ) - 
13.146 
23 - 465 
23- 787. 
11.103 
1 : 1. 78 
1 : .47 
Phosphorus pentoxid (P 2 O fi ). . 
3.860 
5 - 3 8 o 
4 - 349 
4 - 543 
1 :1. 39 
1 :1. 04 
Sulphur trioxid (S 0 3 ) —..... 
Carbon dioxid, not determined 
s.008 
3 - 53 i 
3 - 5 62 
5 * 052 
1 : .71 
1 : 1. 42 
73 - 840 
73 * I 7 ° 
73.069 
220 
From an examination of Table I it is apparent that the water, calcium, 
and sodium content of the sap are fairly constant when collected at two 
different points at the same time during the same year, while the silica, 
iron, aluminum, potassium, phosphorus, and chlorin are the large variable 
constituents, depending on the time and point of collection. The organic 
matter is higher in the sap taken at a point on the main branch about 20 
feet from the root than it is on the same branch closer to the ground or on 
the new branches. The silica, iron, aluminum, calcium, magnesium, and 
sulphur, however, are higher in the sap in the new branches. These facts 
agree with the writer’s previous findings, which show that the minerals ac¬ 
cumulate in the leaves. As the grapevine puts forth leaves every year only 
on the parts of more recent growth, the above results are what one would 
naturally expect when considered in connection with the former work. 
Another interesting point is that certain constituents—namely, silica, 
iron, aluminum, magnesium, and phosphorus—may be about the same in 
the sap when collected from two different points at the same time during 
a given year, but vary widely when compared the following season. 
A further point of interest is that while the ratio of calcium oxid to 
magnesium oxid is fairly constant in each sap of Table I, that of the 
potassium oxid to sodium oxid is variable, as shown in Table III. 
Table III .—Comparison of the ratios of calcium oxid to magnesium oxid and potassium 
oxid to sodium oxid in sap of the -wild grape collected at the same time from different 
points on the vine 
Sample No. 
Ratio of 
calcium 
oxid to 
magnesium 
oxid. 
Ratio of 
potassium 
oxid to 
sodium 
oxid. 
6. 7 : 1 
4. 2 : I 
6. 2 : 1 
9-3 : 1 
5 - 7 : 1 
16. 7 : 1 
4 - 3 : 1 
6. 7 : 1 
-- , 
