to12]—: BRIGGS & SHANTZ—WILTING COEFFICIENT 25 
the moisture equivalent increasing from 1.6 per cent in sand to 
over 30 per cent in the clay loam; while the wilting coefficient 
'_ ranges from 0.9 per cent in sand to 16.5 per cent in the clay loam. 
_ The mean ratio of the moisture equivalent to the wilting coefficient 
for all the soils examined is 1.84. The probable error of this mean 
4 is +o.013; that is to say, considering the series to be representa- 
tive of soils as a whole, the chances are even that if a similar series 
| of determinations were made the mean of the ratios would fall 
between 1.827 and 1.853. 
: TABLE II 
THE RELATION OF THE WILTING COEFFICIENT TO THE MOISTURE EQUIVALENT IN SOILS 
RANGING FROM SAND TO CLAY 
WILTING Ratio oF 
COEFFICIENT MOISTURE 
No. Som TYPE Prncnsocs me EQUIVALENT 
No. dets. Average COEFFICIENT 
ee a Coarse sand 1.6 II 0.9 1.78 
Sagat tae ee Fine sand 4.7 16 2.6 1.81 
vanes Heian Fine sand Bis 3 a8 1.67 
ee .-.| Fine sand 6.7 2 3.6 1.86 
oda ba dames @ Sandy loam 9-7 9 4.8 2.02 
BS Aig kc a wee dy loa 11.9 3 6.3 1.89 
a oe ae Sis, Fine sandy loam 18.1 13 9.7 1.87 
Bee eee 18.9 3 10.3 1.83 
| eee ee Sandy loa 19.6 I 9.9 1.98 
Sees Fine sandy loam 19.9 I 10.8 1.84 
cg pe Fine sandy loam 22.1 I 11.6 1.90 
Sey eee am 25.0 I2 13.9 1.80 
xe ee wie pu ees am. 27.0 I 15.2 1.78 
Ee eee ies Clay loam 27.4 2 14.6 1.88 
| EEE ip ar Clay loam 29.3 4 16.2 1.81 
SP re er ae Clay loam 30.0 I 16.5 1.82 
a ee carte .| Clay loam 30.2 16 16.3 1.85 
. Mean...1.84 
Probable error of mean......... +0.013 
It will be noted that the greatest departures in the ratios are 
_ found among the sandier soils. This is due to the fact that a 
slight experimental error in determining either the moisture 
equivalent or the wilting coefficient affects the ratio markedly 
owing to the small percentages of moisture with which we are 
dealing in these soils. 
The significant feature of the results here presented is the fact 
that through the wide range of moisture retentiveness exhibited 
