Lectures On the Applications of Chemistry And Geology to Agriculture..
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They are all probably made up of some of (he varieties of porcelain clay, more or less intimately mixed with siliceous and ochrey particles — in so minute a state of division that they cannot be separated by the method of decantation above described.
These clays are adopted by the German and French writers as a standard to which they can liken clay soils in general, and by compari- son with which they are enabled distinctly to classify and name them.
As the use of the term clay in this sense ha...s been introduced into Eng- • In an interesting paper on subsoil ploughing by Mr. H. S. Thompson, in the report of the Yorkshire Agricultural Society for 1837, p. 47, it is stated that the lias clays, which form the subsoil in certain parts of Yorkshire, contain sometimes, in the dry state, as much as 54 per ce?tt of alumina {7) t When heated to redness the whole of the water is driven off from these clays, and they then consist respectively of— Silica 54-5 57'4 534 Alumina 45 5 42 6 46 6 1000 1000 1000 which numbers are in accordance with those given at the foot of the preceding page.
What to read after Lectures On the Applications of Chemistry And Geology to Agriculture..?
You can find similar books in the "Read Also" column, or choose other free books by Johnston, James Finlay Weir, 1796-1855. [from Old Catalog] to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
They are all probably made up of some of (he varieties of porcelain clay, more or less intimately mixed with siliceous and ochrey particles — in so minute a state of division that they cannot be separated by the method of decantation above described.
These clays are adopted by the German and French writers as a standard to which they can liken clay soils in general, and by compari- son with which they are enabled distinctly to classify and name them.
As the use of the term clay in this sense ha...s been introduced into Eng- • In an interesting paper on subsoil ploughing by Mr. H. S. Thompson, in the report of the Yorkshire Agricultural Society for 1837, p. 47, it is stated that the lias clays, which form the subsoil in certain parts of Yorkshire, contain sometimes, in the dry state, as much as 54 per ce?tt of alumina {7) t When heated to redness the whole of the water is driven off from these clays, and they then consist respectively of— Silica 54-5 57'4 534 Alumina 45 5 42 6 46 6 1000 1000 1000 which numbers are in accordance with those given at the foot of the preceding page.
What to read after Lectures On the Applications of Chemistry And Geology to Agriculture..?
You can find similar books in the "Read Also" column, or choose other free books by Johnston, James Finlay Weir, 1796-1855. [from Old Catalog] to read onlineMoreLess
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