50 



tion till they b9,ein to wilt. The soil was then mixe^l 



and th* water dr^teraiinod. The air-dry »oil was also 



placed in a saturated atuiosphere to det^rniin*? tlir* hy,'!;ro8- 



copic raoieture. The results follow in the adapted table XX. 



Table XX : Wilting Point of Plants and Hygroscopie 



^'iolSture in Different Soiu.s Employed. 



M oisture y^r 100 Dry Soil %'^ x 1 1 i ng 

 V^en Plants Hygros. T>oint above 



Soil wilted S/iOistur© nygros, kcxsture. 



Coarse eandy coil 1.5 1.15 30.4 



S&ndy garden eoil 4.6 3.00 . 53.3 



Fine huffius seta 6.2 3.98 55.8 



Sandy loam 7.S 5.74 37.6 



Peat 49.7 42,30 12.8 



Th* wide variability of soils xn their capaeity to give 

 up water to plants is shown, but the wilting pcmt is much 

 below ths t found by ''■'hitney, Kxn/^, and others under field 

 conditions. The p^ant employed xn the experinsnt' 

 would affect the results. There is a Buspxcion th'^^t the 

 iiioitture content shon-n in thPR«? r-^-iits is too low, due to 

 cne B.Tsiail containing boxes used, ^<n6. to r,,ixinr the soil 

 Taef ore determining the moistu/w. The soix above where the 

 roots v;ere feedins possibly approaoi^.ed the hygroscopic 

 wunditiOH. "'"'he wilting point is inuch nT^^rer the hygros- 



