30 Richard H. Boerker 
The per cent. of hygroscopic water in the soils was the amount 
of moisture the soils held at room temperature. The amount 
of pore space in the soils was equivalent to the total amount of 
water the soils would hold. This would also be the amount of 
air in the soil when air dry. In determining the amount of pore 
space the soil used was air dry, hence the amount of hygroscopic 
water in the soil had to be added to the amount of pore space. 
The amount of capillary water was the amount of water the soils 
held against gravity. The same soils were used in all three 
experiments and the samples consisted of about 150 grams each 
except in the volume determinations in which 100 cubic centi- 
meters of soil were used in each case. This table shows very 
strikingly the water and air relations in these soils. The great 
amount of air in gravel when it is at its maximum capillary 
water content is also shown approximately. 
The mechanical analyses of representative samples of these 
soils which were kindly furnished by the department of agronomy 
of the University of Nebraska are given below: 
MecHAnIcAL ANALYSIS OF SOILS 
Separate Diameter, Mm. . Loam Sand Gravel 
PS LSO NDT ASE reenter, Seco Shwe INDOVG sae Bi ereiliy sac toy isceme de mene tone 38.639 
Coarsereraviel eon ce nee Base gl hiker iys tall avec cerita nul a Peco ats 40.382 
ine oraivel rae, sei aetse eunenae 20 7.9360 21.045 I4.051 
Coarse’sandi i aoe I=.5 Wega 29.418 4.245 
Miedimmiysandian rein ce ee ee 5 —.25 8.107 21.709 1.062 
ine ssande cavecven ears cytes 25 —.1 I1.392 25.708 0.770 
WEIAY InlNS GAINES os Sob cccc ose gee st OS 6.182 I.074 
LIGA ee ec tat aeraee eels ana aeareng sae .05 —.005 21.704 6 0.268 
(OIE iis fie et oy cuprates Satan, eens oe .005 and less 26.506 “34 
Molatilesmiattercie: us todas eon | gether erste 6.252 0.700 0.583 
IO} te hee Rae ee ee on ieee Mera RAI ant bin assay 100.000 | 100.000 | 100.000 
Besides these determinations soil samples were taken once a 
month to determine how much moisture these soils held at the 
end of a day in the cultures in the greenhouse. These results 
bear out the findings in regard to capillary water held by the 
soils shown in a preceding table. These moisture contents are 
given below: 
