12 D. A. Wells on the Soils of the Scioto Valley. 
Constituents soluble in dilute acid. 
Iron, alumina with traces of manganese, . 01:995 
Organic matter in combination with the above, 01-004 
ilica, 2 i 00-640 
Phosphoric acid, : : ; 00-041 
Potash and soda, . : : : 00-100 
ime, : j ‘ 01-026 
Magnesia, : ; ; ; : 00236 
Total per-centage of constituents soluble in dilute acid, Me 042 
Organic matter rendered solu ble by ammonia, 1840 
soda, 04:368 
Organic matter remaining in scombidtaen with the in- 
soluble residue, and determined by ignition, 04-145 
Whole amount of organic matter found in the soil, as 
extracted by water, acids and alkalies, and also de- 
termined by ignition from the final residue, 11:373 
Whole amount of organic matter determined in another 
equal portion of the same soil by _— : 10:970 
Difference, ; 00-403 
Insoluble silicates and earthy residu ue, 78-842 
One hundred parts of the insoluble residue gave by 
washing and separation, 45 parts siliceous sand, 
and 55 clayey matter 
Total per-centage, of the whole analysis, . ; 98-2844 
Another soil examined was from the “Ree Ree Bottom,” a 
tract of land occasionally overflowed by the Scioto River. It 
has been ‘cultivated fifty-one years; forty-five crops of corn and 
two or three of wheat have been taken off from it; it has also 
been a few years in grass or clover. It has scarcely diminished 
fertility and now with the most ordinary culture yields on an 
average, one year with another, eighty bushels of corn to the acre. 
The analysis of this soil gave— 
Water, hygroscopic and combined, 
Resinous and waxy matters extracted by alcohol 
Constituents soluble in pure water. 
Extract of earth, alkaline Sain ae 032 
Organic matter—crenic acid, . 010 
Iron, lime and silica, ‘ . : ‘012 
Total water extract, s+ Oe 
‘Total per-centage of the same, : : . 0190 
Constituents soluble in ue acid. : 
Iron, alumina and mangan 2760 
7 matter one with the above, some O60 
Silica, . i = . 0-560 
ime, 2 — Ce ae yes 4 0-390 
