364 
SOILS AND AGRICULTURE OF NORFOLK. 
water through a sieve of 100 linear meshes to the inch, the 
drippings being collected in a beaker. The residue on the 
sieve is dried and ignited. It includes the particles varying 
from 3 mm. to inch, and further sifting through a 1 mm. 
sieve divides it into two fractions. The smaller particles 
have come through the 100 linear inch mesh sieve and are 
in the beaker. They are separated by a process of sedimenta- 
tion. The water is made up to a depth of 8'5 c.m. and 
allowed to stand 85,000 seconds — 24 hours — this is equivalent 
to making up to 10 c.m., and allowing to settle for 100,000 
seconds, the liquid containing the particles that are too 
light to fall through the water and settled on the bottom is 
poured off into a large vessel, the beaker refilled, and the 
pouring off repeated each day until the liquid is clear after 
Table I. 
Fraction. 
Range in size of 
particles. 
How separated. 
Fine gravel 
ito 
h in - 
By sifting through a sieve 
of ^ in. mesh. 
Coarse sand 
1 
1 
TiTo r> 
By sifting through a sieve 
of in. mesh, 
Fine sand 
1 
10 0 
i 
5W )) 
By allowing soil to settle 
through 10 c.m. for 100 
seconds. 
Coarse silt 
i 
sTnr n 
1 
HftOO 11 
By allowing soil to settle 
through 10 c.m. for 
1000 seconds. 
Fine silt 
^stro' >> 
1 
3 0 0 0 11 
Particles falling through 10 
c.m. water in less than 
100,000 secs, and more 
than 1000 seconds. 
Clay 
1 
3 0 0 0 11 
Particles in soil not settling 
in 10 c.m. water stand- 
ing 100,000 seconds. 
