=232. Classification of Results.=—A convenient method of stating the results of an analysis may be seen from the following classification. The percentage obtained for each of the classes is to be entered in the column provided for that purpose. No. Names of Silt Diameter of Velocity of Classes. grains in current Per millimeters. millimeters cent. hydraulic value. Sieves. 1. Grits 1 –3 2.07 „ 2. Fine grits 0.5–1 „ ─────────────────────────────────────────────────────────────────────── Elutriator 3. Coarse sand 0.50 64 0.55 without churn. „ 4. Medium sand 0.30 32 „ „ 5. Fine sand 0.16 16 „ ─────────────────────────────────────────────────────────────────────── Elutriator 6. Finest sand 0.12 8 0.21 with churn. „ 7. Coarse silt 0.072 4 1.21 „ 8. Large silt 0.047 2 2.92 „ 9. Medium silt 0.036 1 7.36 „ 10. Silt 0.025 0.5 8.86 „ 11. Fine silt separated 0.016 0.25 7.85 in elutriator ─────────────────────────────────────────────────────────────────────── Beaker 12. Fine silt separated 0.010 <0.25 35.22 sedimentation. from clay water „ 13. Clay 0.0001 <0.0023 33.16 ————— Total 99.36 The measurements of diameters in the above table is of the best formed quartz grains in each class. Naturally the actual size of the particles may vary in each class within the extreme limits of the diameter next above and below. It is not easy to indicate in popular language distinctions not popularly made but the grades of particles designated by the names grits, sand and silt, may serve, at least, to establish uniformity of expression. The term grits is thus applied to all grains above one millimeter in diameter up to gravel. Below one millimeter down to 0.1 millimeter may be called sand and below that silt may designate the particles down to an impalpable powder.