223 
The Kimmeridge Clay* from its analysis, might be termed 
a stiff calcareous soil, containing 12 per cent, of carbonate 
of lime, — a quantity greater than any found in the limestone 
soils of Doncaster, which affords another instance of the 
impossibility of judging of the productiveness of soils by 
their component parts. Mr. Spence, the analyst of these 
soils, remarks, " that this clay appears to contain every 
thing, unless free carbonic acid and water, that we are taught 
to believe essential to vegetable life : yet its mechanical con- 
stitution, from being almost impermeable to air and water, 
renders it n Vly as sterile as the worst of soils. The silica 
in the specimen analysed is not siUceous sand, but impal- 
pable; arid the coarse particles being concretions of the 
impalpable parts, the entire constituents of the clay are 
finely divided matter." 
The Kelloways Rock and the beds of the Inferior Oolite 
Or if stated as the wold soils, 
Deposited in 3| minutes 47 
Remainder 53 
100 
* Kimmeridge Clay from E Houghton Dale 
Specific gravity. 
Mechanical Analysis. 
100 parts diffused in water. | 
Deposited in 4 a minute 31 
Do. in 3 minutes longer 16 
Do. in 10 hours longer 44 
Remainder in solution or suspension 9 
100 
Chemical Analysis. 
Matter ^ Sulphate of lime 0.2 
soluble >■ Do. of potash 0.1 
in water. ) Chloride of sodium 0.2 
Siliceous sand insoluble in nitric 
and sulphuric acids 54.5 
Alumina 16.5 
Oxide of iron 10 
Carbonate of lime 12 
Phosphate of lime 1.5 
Carbonate of magnesia 1 
Potash existing in the clay as a 
silicate 2.6 
Loss 1.4 
100 
The same analysed by Mr. R. Phillips, 
of the Museum of Economic Geo- 
logy, No. 6, Craig's Court, London. 
Silica 44 4 
Alumina 22.1 
Peroxide of iron 7,3 
Carbonate of lime 15. 
Carbonaceous matter 4. 
Moisture and loss 7.2 
100 
