Relation of Xona callable Water to Hygroscopic Coefficient 65 
Cylinder with no free water in the subsoil. — Cylinder XI 
was filled, like XTTT, with subsoil containing 5.8 per cent total 
water. The four plants in this fell behind those in the other 
cylinders at the end of the first month, making no growth after 
March 12. On March 28 they all wilted and from this time on 
slowly died, all being dead on May 9, none having put forth a 
spike or formed a tiller. Four days later the cylinder was opened. 
The moisture conditions and the root development were almost 
identical with those in cylinder XIII of the Red Fife wheat series. 
The free water in the subsoil amounted to only 0.2 per cent, the 
same as when the seed was planted, and that in the surface foot 
was — 3.9 per cent. Only one very small root, less than two 
inches long, was found in the uppermost three-inch section of the 
subsoil ; this is not shown in figure 15, having been lost. The same 
remarks are applicable to the growth of the plants in this cylin- 
der as to those in cylinder XIII. The amount of water lost per 
gram of dry matter produced was correspondingly high, viz, 1345 
grams. 
Cylinder with 1 per cent free water in the subsoil. — Cylin- 
der XV. like XIV in the previous series, was filled with moist 
subsoil containing 9.8 per cent total water or 4.2 per cent free 
water. The plants continued to grow until about March 18. On 
April 2 all were slightly wilted. Later in the month three of the 
plants began to slowly improve and on April 30 these three car- 
ried 5 tillers, but the fourth plant was dying. On May 27 two of 
these three were dying, but the other had put forth a spike, and 
altho no distinct growth was made after this date, the plant still 
gave promise of forming grain as late as the evening of June 11 ; 
one other plant, altho dying, was not yet dead, but the remaining 
two were quite dead. On June 12 both plants died. Two days 
later, on opening the cylinder, the moisture conditions and root 
development were found very similar to those in XIV. The free 
water in the subsoil was a little higher, 1.1 per cent against 1.0 
per cent, but was similarly distributed, rising steadily from 0.3 
per cent in the second foot to 2.8 per cent in the sixth — practically 
the wilting coefficient. 
Here, as in XIV, the plants did not die simultaneously, altho 
they all wilted for the first time on the same day. With more 
favorable weather conditions, it seems probable that grain 
would have developed in the one spike which had been put forth. 
Cylinder with 8 ter cent free water in the subsoil. — 
Cylinder XVII, corresponding to XIX in the Red Fife wheat 
series, started with 7.8 per cent free water. Three of the four 
plants grew steadily without wilting up to June 11, when thev 
3 
