Dec. 20. 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 magnesitim 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 



Ratjo of 

 calcium 

 oxid to 



Ratio of 

 potassium 

 oxid to so- 

 dium oxid. 



852 

 854 

 900 

 902 



6.7:1 



6. I : I 



5-7:1 

 5-9:1 



4. 2 : I 

 21. 3 : I 

 16. 7 : I 

 28. 7 : I 



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 



Sample 

 No. 28s. 



Sample 



No. 812. 



Sample 

 No. 852. 



Ratio be- 

 tween mini- 

 mum and 



Water at 100° C 



Organic matter 



Silica (SiOa) 



Ferric and aluminic oxids (FegOa 



+AI2O3) 



Calcium oxid (CaO) 



Magnesium oxid (MgO) 



Sodium oxid (NajO) 



Potassium oxid (KjO) 



Phosphorus pentoxid (P2O5) 



Sulphur trioxid (SO3) 



Chlorin 



Total 



^'4 



Nitrogen as nitrates 



Crude ash 



99- 6340 

 . 2782 

 .0005 



. 0006 

 . 0220 

 .0044 

 . 0017 

 .0468 

 . 0058 

 .0052 

 . 0008 



99. 8665 

 .0917 

 .0005 



. 0002 

 . 0206 

 - 0043 

 . 0016 

 . 0112 

 . 0017 

 . 0016 

 . 0001 



99- 8279 

 •1435 

 . 0001 



. 0001 

 . 0160 

 . 0024 

 . 0012 

 .0050 

 • 0015 

 . 0019 

 . 0004 



99- 8183 

 - 1305 

 • 0003 



. 0001 

 -0234 

 . 0041 

 . 0010 

 . 0167 

 .0030 



007 s 

 1130 



100. 0000 



r. 00067 



. 00048 

 • 0S70 



0009 



0013 



0384 



100. 0000 

 I. 00082 



00004 

 07000 



I : I. 00 



I : 3- 03 



I : 5. 00 



I : 6. 00 

 I : I. 46 

 I : I. 83 

 I : I. 70 

 I : 9. 36 

 I : 3. 87 

 I : 3-25 

 I : 8. 00 



: 187. 50 

 : 2.94 



