Dec. 20, 191S Mineral Composition of Sap, Leaves, and Stems 



537 



Table XIV. — Variation in percentage composition of young green stems of wild-grape 

 vine in the same and in different years 



Water at 100° C 



Organic matter 



Silica (SiOa) 



Ferric and aluminic 



oxids (FeaOg+AljO.,) 

 Calcium oxid (CaO). . . . 

 Magnesium oxid (MgO). 

 Sodium oxid (NagO) — 

 Potassium oxid (KgO). . 

 Phosphorus pentoxid 



(P2O5) 



Sulphur trioxid (SO3) . . 



Total 



Crude ash 



Sample 

 No. 628. 



79. 2500 



20. 0437 



. 0041 



.0003 

 . 1114 



• 0346 

 .0171 

 •3883 



• 1277 

 . 0228 



100. 0000 

 I. 0200 



Sample 

 No. 909. 



84. 2750 



14. 8654 



. 0048 



.0051 

 •1558 

 •0539 

 .0078 

 .4813 



•105s 

 •0454 



100. 0000 

 I. 1490 



Sample 

 No. 911. 



81. 9385 



17. 0893 



. 0069 



.0038 

 . 2244 

 . 0642 

 •0133 

 •5154 



. 1078 

 .0364 



100. 0000 

 I. 2810 



Sample 

 No. 913. 



3210 



7397 

 0037 



0567 

 0158 

 4846 



0246 



100. 0000 

 3790 



Sample 

 No. 915- 



82 



6645 



4453 

 0040 



0032 

 1792 



0557 

 0093 

 5098 



1009 

 0281 



100. 0000 

 1.217s 



Ratio be- 

 tween mini- 

 mum and 

 maximum. 



I : I. 06 



I : 1-35 

 I : I. 86 



17. 00 

 2. 23 

 1.86 

 2. 19 

 1-33 



1.27 

 1.99 



r-35 



Table XV. — Percentage composition of ash of samples in Table XIV 



In Tables XII and XIV it will be found that the ratio between the 

 lowest and the highest result obtained for each of the other mineral 

 constituents in the several samples of leaves and stems is more constant 

 than it is for the silica, iron, and aluminum. It will further be found 

 that the results obtained this year on the different samples corroborate, 

 except in one instance, those of 191 2 in showing that there is a con- 

 centration of all the constituents in the leaf compared with the stem, 

 and the exception is that whereas the potassium content of the stem 

 in 1 91 2 was greater than in the leaf, this year (191 5) it was less in every 

 case.- 



