586 The Philippine Journal of Science 1920 
Concentration, atmospheres. 
0 05 10 16 $5 AS 45.6 GS 7.0 
L10 r= 
| / \ | Dey waight of tops, SIZ 
100 \ 
4 oe 
d I23 
090\— \. 
080 ul 242 
oo site: ee08e,,. 
fs Shere ne ie “Woe 
ae (oe e771 . eee 
Grams, 
~ 
= 
0.70 ii — = 
060 
freed, 
035 Pa ek Dry weight of roots, SJ 
5 d aX, | 522 | 
Nites, ©. 
030 ae ies 4 
fg iw 1 S| 
| jane O° wt 
“* xo : 
025 fe ey 
ite nd te 
“hy 
020 
Fic. 10. Graphs of average actual yields (grams) of wheat tops and of roots for series Iv. 
Water-absorption——The water-absorption data for this series 
are Shown in Table 16, which corresponds in arrangement to 
the preceding table. These data have been plotted as graphs 
in fig. 11, where the method of plotting is similar to that em- 
ployed in the preceding figure. 
