Relation of Nonavailable Water to Hygroscopic Coefficient 71 
Total water. The plant in this made a somewhat more rapid 
growth than that in XYIIT but the two were very similar in 
growth thruout. forming heads, blooming, and showing signs of 
injury from drouth at about the same time. Both had ripe seeds 
and were dying on June 11 but neither was vet quite dead. The 
plant in XXI bore 21 grains. These two were the only plants in 
the six cylinders that at any time gave promise of forming heads. 
In both cylinders the roots were abundant and uniformly dis- 
tributed thruout the subsoil but in XXI the fine roots were more 
numerous than in XVIII. In XXI. as in XVIII. the free mois- 
ture of the subsoil had been almost exhausted, there being only 
2d 
ft. 
3d 
ft. 
4th 
ft. 
5th 
ft. 
6th 
ft. 
XII XVI XVIII XXI IV in 
Fig. 17. Roots of milo; experiment of 1910. 
an average of 0.3 per cent, quite uniformly distributed, at the 
time of the death of the plant. 
TWO CYLINDERS WITH MOISTER SOIL NEAR THE SURFACE. Cylin- 
ders III and IV were filled, as described on page 18 ? with dry 
subsoil and surface soil, and then enough water was added to 
raise the total amount of water to the equivalent of 18 per cent of 
the subsoil and 25 per cent of the surface foot. During the early 
part of the experiment the two plants in these two cylinders made 
