================================== Designation.|Diameter.|Percentage. ------------+---------+----------- { | .50 mm. | 14.24 { | .30 “ | 15.17 Sand { | .16 “ | 8.88 { | .12 “ | 5.60 | | { | .072 “ | 6.75 { | .047 “ | 8.35 Silt { | .036 “ | 8.55 { | .025 “ | 6.03 { | .016 “ | 17.77 | | “Clay” | ? | 7.50 ------------+---------+----------- It would seem the best and almost only remedy to be applied to such soils as these is the introduction of vegetable matter or green-manuring, by which their texture is loosened: for the hauling of mere clay upon the land would hardly accomplish the purpose intended, within the limits of farm economy. _Dust Soils_, which during the dry season are even in their natural condition so loose as to rise in clouds and render travel very uncomfortable, are not uncommon in arid countries, _e. g._, in Washington and adjacent parts of Oregon, on the uplands bordering the Columbia, Yakima and Snake rivers. The physical analyses of three of such soils, given in the table below, will convey some idea of their peculiarities in this respect. PHYSICAL ANALYSIS OF DUST SOILS. ========================================================= |Hydr. Value.|Diameter. |No 17.|No. 37.|No. 79. ----------+------------+----------+------+-------+------- Clay |<.0023. mm. |<.10--? | .93| 3.59 | 1.27 { |<.25 mm. | .010 | 30.93| 13.06 | 32.29 Silt { | .25 to .5| .016 | 3.20| 5.82 | 12.75 { | .5 to 2.0| .025-.047| 7.18| 27.37 | 37.51 { |2.0 to 8.0| .047-.120| 21.88| 43.78 | 10.92 Sand |8.0 to 64.0| .12- .50 | 32.39| 49.57 | 3.97 | | +------+-------+------- Total | | | 96.57| 98.18 | 98.72 ----------+------------+----------+------+-------+-------