535 
Dec. so, 191s Mineral Composition of Sap , Leaves , and Stems 
Table IX shows that the ratio of calcium oxid to magnesium oxid 
is fairly constant in the different samples, while the wide variation in 
the potassium oxid and sodium oxid from 27.5 in 1912 to 4.2 in 1914 
would indicate that these figures were obtained from the sap of different 
plants rather than from that of the same vine at different times. 
Tabl,B X .—Variation in percentage composition 1 of fresh sap of wild grape collected for 
three successive days ana nights 2 
Constituent. 
Sample 
No. 902. 
Sample 
No. 903- 
Sample 
No. 904* 
Sample 
No. 905. 
Sample 
No. 906. 
Sample 
No. 907* 
Ratio 
between 
minimum 
and max¬ 
imum. 
Water at ioo°C. 
Organic matter. 
Silica (SiOs). 
Ferric and aluminic oxids 
(Fea 08 +AI2O3). 
Calcium oxid (CaO). 
Magnesium oxid (MgO). 
Sodium oxid (NaaO). 
Potassium oxid (K2O). 
Phosphorus pentoxid (PaOs).... 
Sulphur trioxid (SO3). 
Ctilnrin, tint Hptprminpd. 
99. 7026 
. 2208 
.0007 
.0003 
.0277 
.0047 
.OOIX 
.0316 
.0069 
.0036 
99 * 7354 
.1971 
.0006 
.0002 
.0248 
.0042 
.0008 
.0279 
.0060 
.0030 
99 - 7436 
. 1766 
.0008 
.0005 
.0248 
.0089 
.0039 
.0296 
.0077 
.0036 
99 * 7473 
. 1892 
.0007 
.0001 
.0245 
.0049 
.0008 
.0239 
.0056 
.0030 
99 * 7592 
•1732 
.0005 
• 0005 
.0228 
.0070 
.0041 
.0245 
.0054 
.0028 
99.7469 
.1874 
.0007 
.0001 
■0233 
.0045 
.0014 
.0254 
.0067 
.0036 
1: 1.00 
1: 1.27 
1: 1.60 
1 : 5.00 
1: 1.21 
1: 2.12 
1 : 5 *13 
1: 1.32 
1: 1.43 
1: 1.29 
Total. 
Crude ash. 
100.0000 
.1012 
100.0000 
.0916 
100.0000 
.0925 
100.0000 
.0843 
100.0000 
. 0780 
100.0000 
.0839 
1 : 1.30 
1 By volume. 
2 Nos. 902, 904, and 906 were collected on successive days; Nos. 903, 90s, and 907 were collected on succes¬ 
sive nights. 
Table XI .—Percentage composition of ash of samples in Table X 
Constituent. 
Sample 
No. 902. 
Sample 
No. 903. 
Sample 
No. 904. 
Sample 
No. 905- 
Sample 
No. 906. 
Sample 
No. 907- 
Ratio 
between 
minimum 
and max¬ 
imum. 
Silica (SiOo).. 
Ferric and aluminic oxids 
(FeA+AlA). 
Calcium oxid (CaO). 
Magnesium oxid (MgO). 
Sodium oxid (Na^O). 
Potassium oxid (K 2 0 ). 
Phosphorus pentoxid (P 2 0 5 ). 
Sulphur trioxid (S 0 3 ). 
Carbon dioxid, not deter¬ 
mined ... 
0. 678 
*254 
27. 386 
4. 602 
1. 078 
31.198 
6. 771 
3-564 
0. 691 
.267 
27. 068 
4. 621 
.823 
30.478 
6. 544 
3* 261 
O. 884 
• 590 
26. 820 
9. 607 
4. 220 
3 1 - 9 s6 
8. 271 
3. 841 
O. 804 
.079 
29. 034 
5. 840 
I. 006 
28. 277 
6. 604 
3 - 524 
0. 641 
. 641 
29. 167 
8-939 
5.269 
3 i- 43 ° 
6.950 
3. 628 
0. 788 
. IIO 
27. 796 
5-366 
I. 672 
30.232 
7 * 999 
4 * 327 
i : 1. 38 
1 : 8. 11 
1 :1. 09 
1 : 2. 09 
1 : 6. 40 
1 ; 1.13 
1 ; 1. 26 
1 : i- 33 
Total.. 
75 - 53 i 
73 - 753 
86. 219 
75- 168 
86. 665 
78. 290 
Referring to the results in Table X, it will be seen that there is a con¬ 
siderable variation occurring daily in the mineral composition of the sap 
and that, as a rule, most of its constituents are present in larger amounts 
during the day, while, on the other hand, its composition is more constant 
at night (Table XI). 
