536 



Journal of Agricultural Research 



As there was such a wide variation in short periods of time in the com- 

 position of the sap of this vine, it was thought desirable to collect further 

 samples of the young leaves and stems in order to determine if this would 

 hold true in regard to these parts. Accordingly, in June, 191 5, or two 

 months after the sap was first collected, and every two weeks thereafter 

 for six weeks, samples of the succulent young stems and leaves repre- 

 senting the same stage of growth were taken. Therefore, the results are 

 somewhat comparable with each other and with those formerly obtained, 

 since the earlier samples were taken in a similar manner in Nos. 908 and 

 909. The consecutive analyses are given in Tables XII to XV along with 

 those of Nos. 627 and 628 of 191 2. 



Table XII. 



-Variation in percentage composition of young green leaves of wild-grape 

 ■vine in the same and in different years 



Constituent. 



Sample 

 No. 627. 



Sample 

 No. 908. 



Sample 

 No. 910. 



Sample 

 No. 912. 



Sample 

 No. 914. 



Ratio 

 between 

 minimum 



and 

 maximum. 



Water at 100° C.' 



Organic matter 



Silica (SiOa) 



Ferric and aluminic 



oxids (Fe.Os-f-AlaOa). . 



Calcium oxid (CaO) 



Magnesium oxid (MgO). . 

 Sodium oxid (NajO) . . . . 

 Potassium oxid (KgO). . . 

 Phosphorus pentoxid 



(P2O5) 



Sulphur trioxid (SO3) . . . 



Total 



Crude ash 



75. 4700 



22. 8500 



• 1372 



. 0214 

 . 7200 

 •1337 

 •0356 



•3427 



. 2260 

 .0634 



75. 1200 



23.3181 



.0514 



.0197 

 •5478 

 . 1112 

 . 0167 

 .5619 



. 2104 

 . 0428 



71- 1975 

 26. 8851 

 0642 



0394 



7585 



0214 

 5943 



1043 



100. 0000 

 2. 3300 



100. 0000 

 2. 0140 



100. 0000 

 2- 4595 



1525 

 3750 

 0291 



0117 



5515 

 1004 

 0236 

 5076 



1891 

 0595 



72. 6015 

 25. 9097 

 0537 



0165 

 4427 

 1078 

 0287 



5752 



1992 

 0650 



100. 0000 

 I- 9530 



00. 0000 

 I. 8790 



I : I. 06 

 1:1. 18 

 1:4.71 



1:3-37 

 1:1.71 



1:2. 13 

 I : I- 73 



1:1. 20 



1:2.44 



1:1.31 



