EB. W. Hilgard—WSilt analysis of Soils and Clays. 337 
open to criticism ; since it is not easy to indicate in popular 
language, distinctions not popularly made. 
Table of Diameters and Hydraulic Values of Sediments. 
Designation of Diameter of Velocity pr. sec., or 
No. materials. Quartz grains. Hydraulic value. 
pe ewaree Uris, ec i 1—3 ™ 
2, Fine Ot, Ue a eee oe ‘i 
ee Soares Sand, ... 2-222 2. 80—90 (45) “ eae 
4, Warden FS ae 50—55— “ 9 ao 
5. Fine sg : 25—30 “* 1 
er aa OM led ee oe 20-82: a9 
7. Dust Misia ras sage y chord 12-14% att 
Oe Alenrabst Gilt ius ew. 2% s—9 =“ es 
TRO i og eset gies Gf af Beta 
ie MOON 8s ee souls 4—5 “ a -* 
oe “ se sigs waeiscty: cal ae 0-25: * 
12, Finest 66 0°1—2°0 “ 0-25 “ 
, 13, Clay sy ? <0°0023 “ 
assumes a paraboloid form, which is sensibly more convex m a 
tube of small diameter than in a wide one; the results obtained 
™ the latter being, of course, nearest the truth. ee 
_ Still, the accompanying samples of sediments from Missis- 
Sipp! soils and subsoils show at once, even to the na eye, 
that the assorting process has been quite successful, and that 
o etermined and exhibited to the eye, with a very satisfac- 
degree of accurac 
~ examination of the physical and chemical properties of soils 
and clays, we shall be able to fulfill, in a great measure, the 
Aw. Jour, Sor—Tup a Vot. VI, No. 35.—Nov., 1878. 
