532 



Journal of Agricultural Research 



Vol. V, No. 12 



Table 1Y .—Variation in percentage composition of fresh sap collected at the same point 

 on the wild-grape vine at different times duri^ig the same season ' 



Sample 

 No. 852. 



Sample 

 No. 854. 



Sample 

 No. 900. 



Sample 

 No. 902.'> 



Ratio between- 



Nos. 852 

 and 834. 



Water at 100° C 



Organic matter 



SUicaCSiOj) 



Ferric and aluminicoxids (FejOaH- AI2O3). 



Calcium oxid (CaO) 



Magnesium oxid (MgO) 



Sodium oxid (NajO) 



Potassium oxid (K2O) 



Phosphorus pentoxid (P2O5) 



Sulphur trioxid (SO3) 



Chlorin 



Total. 



"t' 



Nitrogen as nitrates . 

 Crude ash 



9- 7545 

 .1821 

 .0003 

 .0001 

 .0221 

 .0036 

 .0013 

 .0277 

 •0045 

 .0037 

 .0001 



0003 

 0001 

 0234 

 0041 

 0010 

 0167 

 0030 

 0025 

 000 1 



.0007 

 .0003 

 .0277 

 .0047 

 .0011 

 .0316 

 .0069 

 .0036 



5-54 

 3.00 

 I. 95 



1 Nos. 852 and 854 were collected in 1914; Nos. 900 and 902, in 1915. 



I Composition by volume, but this does not appreciably aSect the percentage by weight. 



Table V. — Percentage composition of ash of samples in Table IV 



: 1. 69 

 : 2- a 

 : 3-00 



I : 1.B9 

 I : 2.30 

 I : 1.44 



Constituent. 



Sample 

 No. 852. 



Silica (SiOz) ; o. 339 



Ferric and aluminic oxids | 



(FeaOg+Al-OJ .261 



Calcium oxid (CaO) ! 41. 628 



6. 364 

 3-234 

 3. 146 

 3. 860 



Magnesium oxid (MgO) 



Sodium oxid (Na^O) 



Potassium oxid (KoO) 



Phosphorus pentoxid (P2O5) 



Sulphur trioxid (SO3) 5. 008 



Carbon dioxid, not determined 



Sample 

 No. 854. 



0.371 



•093 

 25. 627 

 4. 225 

 1.486 

 32. 080 

 5.269 

 4. 271 



Sample 

 No. 900. 



0.485 



• 143 

 33- 432 

 5.828 

 1.483 

 23- 787 

 4-349 

 3-562 



Total 73-840 ! 73-422 ' 73. 069 



Sample 

 No. 902. 



O. 678 



•254 

 27-386 

 4. 602 

 1.078 

 31. 198 

 4- 771 

 3-564 



Ratio between- 



Nos. 852 Nos. 900 

 and 834. and 902. 



I : I. 09 



I : .36 

 I : . 62 

 I : .66 

 I : .46 

 I : 2. 44 

 I : I- 37 



I : I. 40 

 I : I. 78 



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- 



