Wells on the Soils of the Scioto Valley, Ohio. 329 
Constituents soluble in dilute Acid. 
Iron, Alumina, and traces of Manganese, = 1.629 
Organic matter combined with Iron, Alumina, &e. = 0.550 
Siliea, i EE do 
Phosphoric Acid, (traces,) 
Lime, = 981 
Magnesia, = .102 
Alkalies, (traces,) 
= 3.190 
Percentage on the whole ‘amount acid extract, 
Organi matter 1 1 soluble by Ammonia, Apocrenic Acid, — 02.530 
Organic matter rendered soluble by soda, nm 9 
Organic matter remaining with the insoluble silicates, and de- 
| 
a 
-_ 
termined by ignition, = 1.600, 
Insoluble silicates, = 88.520 
98.159 
Total, 
100 parts of the insoluble residue consisted of 70 parts silicious sand, 
With a few particles of feldspar and yellow jasper; 30 parts clayey 
Matter. 
Several points noticed during the examination of these 
soils of the Scioto Valley, Ohio, I consider as especially worthy 
of attention. Their great fertility is generally known, as 
well as their general character and chemical composition, but 
I am not aware that any extended and thorough examination 
of a suite of specimens from known localities has heretofore 
been made by any chemist. tec 
The first and perhaps the most interesting fact — ee 
the examination of these soils, is the remarkable degree -* 
fineness of their constituent particles. In this respect, jen 
ture to assert, that they are not surpassed by md A y às 
vial deposits upon the surface of the earth ; aye of pam 
being little else than impalpable powders. In commencing 
their examination it was at once seen that a baec 
division of these soils, by means of the sieves ordinarily ge 
in soil analyses, would not afford a fair indication d e 
minuteness of their particles. I therefore procured a sieve of 
e finest gauze, the largest meshes of which, by T. 
JOURNAL B, S. N.H. —— 43 a 
