532 
Journal of Agricultural Research 
Vol. V, No. 12 
Table IV .—Variation in percentage composition of fresh sap collected at the same point 
on the wild-grape vine at different times during the same season 1 
Constituent. 
Water at ioo°C. 
Organic matter. 
Silica (SiOa). 
Ferric and aluminic oxids (FesC>3+ AI2O3).. 
Calcium oxid (CaO)... 
Magnesium oxid (MgO). 
Sodium oxid (NaaO). 
Potassium oxid (K2O). 
Phosphorus pentoxid (PaOs). 
Sulphur trioxid (SO3). 
Chlorin. 
Total. 
. 2s 0 
. 
Nitrogen as nitrates. 
Crude ash. 
Sample 
No. 852. 
Sample 
No. 854. 
Sample 
No. 900- 
Sample 
No. 902.& 
Ratio between— 
Nos. 852 
and 854. 
Nos. 900 
and 902. 
99.8279 
99-7545 
99.8183 
99.7026 
1: 1.00 
z: 1.00 
•1435 
.1821 
•1305 
. 2208 
1:1.27 
1: 1.69 
. 0001 
.0003 
• 0003 
.0007 
1 : 3.00 
1: a -33 
.0001 
.0001 
.0001 
.0003 
1: 1.00 
1: 3.00 
.0160 
. 0221 
.0234 
.0277 
1 : 1.38 
1:1.18 
.0024 
.0036 
.0041 
.0047 
1: 1.5° 
1: 1.15 
.0012 
.0013 
.0010 
.0011 
1 : 1.08 
1 : 1.10 
• 0050 
.0277 
.0167 
• 0316 
1 : 5 - 54 
1 : 1.89 
.0015 
• 0045 
.0030 
.0069 
1 : 3-00 
1 : 2.30 
.0019 
.0037 
.0025 
.0036 
1: 1 .95 
1: 1.44 
. 0004 
.0001 
. 0001 
1: -25 
100.0000 
100.0000 
100.0000 
100.0000 
1.0009 
I. 000 7 
I. 00082 
1: 1.00 
. 0013 
. 0028 
. 00004 
1 : 2.15 
.0384 
.0863 
. 0700 
. 1012 
1 : 2.25 
1 : 1.45 
1 Nos. 852 and 854 were collected in 1914; Nos. 900 and 902, in 1915. 
b Composition by volume, but this does not appreciably affect the percentage by weight. 
Table V. —Percentage composition of ash of samples in Table IV 
Constituent. 
Sample 
No. 852. 
Sample 
No. 854. 
Sample 
No. 900. 
Sample 
No. 902. 
Ratio between— 
« 
Nos. 852 
and 854. 
Nos. 900 
and 902. 
Silica (Si 0 2 ). 
0 - 339 
6* 371 
0.485 
O. 678 
1 : 1.09 
i : 1. 40 
Ferric and aluminic. oxids 
(FeA+AlA) . 
. 261 
•093 
• 143 
• 254 
1 : .36 
1 : 1. 78 
Calcium oxid (CaO). 
41. 628 
2$. 627 
33 - 432 
27. 386 
i : .62 
1 : .82 
Magnesium oxid (MgO). 
6 . 364 
4 . 225 
5. 828 
4. 602 
1 : .66 
1 : • 79 
Sodium oxid (Na^). 
3 - 2 34 
I. 486 
1. 483 
I. 078 
1 : .46 
1 : • 73 
Potassium oxid (K 2 0 ) . 
13. 146 
32. 080 
23- 787 
3 1 * *98 
1 : 2. 44 
1 : x. 31 
Phosphorus pentoxid (P 2 O g ) . .. 
3. 860 
5. 269 
4-349 
4.771 
1 : *• 37 
1 : 1. 56 
Sulphur trioxid (S 0 3 ) . 
5. 008 
4- 271 
3 - S62 
3 - 564 
1 : .85 
1 : 1. 00 
Carbon dioxid, not determined. 
Total. 
73. 840 
73.422 | 
73.069 
73 - S 3 1 
In Table IV it appears that in both years there is a concentration of 
practically all the minerals in the sap at the end of the sap flow, or when 
new leaves develop, compared with the beginning. The ratio of increase 
of some of the minerals—namely, silica, iron, aluminum, potassium, 
phosphorus, and sulphur—in one or both years is much greater than the 
remainder. There is also a wide variation in the percentages of ash in 
the different samples, which partly accounts for some of these differences 
(Table V). Furthermore, an examination of the ratios of calcium oxid to 
magnesium oxid and potassium oxid to sodium oxid shows that the 
former remains fairly constant, while the latter is variable and demon- 
