SOILS AND AGRICULTURE OF NORFOLK. 
365 
standing for 24 hours, which means that all the remaining 
particles have sufficient mass to settle within that time. 
The poured off water is separated and ignited after the very 
fine particles have been flocculated by addition of ammonium 
chloride. This fraction is the “ clay.” By allowing the 
soil particles to settle through water for fixed periods these 
other fractions are separated out, dried, ignited, and weighed, 
and in all six of these fractions are obtained. 
Analyses of Norfolk Soils. 
Table II. 
Mechanical separations of some Gault Soils : — 
Constituent. 
Wretton. 
Gayton. 
Soil— 
Stones 
2'00 
o-oo 
Fine gravel 
2-90 
2-90 
Coarse sand 
34T5 
15-20 
Fine gravel 
26-47 
8-49 
Coarse silt 
3-87 
8-44 
Fine silt 
5-80 
21-89 
Clay 
12-90 
9-67 
Moisture, organic matter 
and loss on ignition . . 
7-85 
16-25 
Subsoil — 
Stones 
690 
o-oo 
Fine gravel 
3-62 
1-30 
Coarse sand 
40-87 
6-85 
Fine sand 
25-20 
15-57 
Coarse silt 
3-68 
4-90 
Fine silt 
5-30 
4-77 
Clay 
13-10 
19-25 
Moisture, organic matter 
and loss on ignition . . 
6-23 
16-5 
Vol. IX. 
F 
