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Updated: May 23, 2025
If, however, you ever wish to use raw rock phosphate, insist upon its being sufficiently fine-ground that at least ninety per cent. of it will pass through a sieve with ten thousand meshes to the square inch, this being no finer than is required for the basic slag phosphate, of which several million tons are now being used each year in the European countries.
Even books which were protected by glass doors, and papers shut up in drawers, did not escape this filthy powder, composed of the fine-ground dust and excrement of the London streets. If I wiped a picture with a white silk handkerchief, a black stain showed itself upon the handkerchief, and this in spite of the most careful efforts to keep the house clean.
On the southern slope of those mountains, trout are caught in great numbers, in the swift streams which rush from the glaciers, and where the water is of icy coldness, and so turbid with particles of fine-ground rock, that you cannot see an inch below the surface.
Paddling to the nearest and driest-looking part of the moraine flat, we stepped ashore, but gladly wallowed back into the canoe; for the gray mineral mud, a paste made of fine-ground mountain meal kept unstable by the tides, at once began to take us in, swallowing us feet foremost with becoming glacial deliberation.
Then sang Thormod: "Thou wonderest, sweet bloom, at me, A man so hideous to see. The arrow-drift o'ertook me, girl, A fine-ground arrow in the whirl Went through me, and I feel the dart Sits, lovely lass, too near my heart." The girl said, "Let me see thy wound."
This particular three-year rotation has been followed at the Ohio Agricultural Experiment Station for thirteen years, and the average yield of wheat has been, not twenty bushels, not sixteen bushels, but eleven bushels per acre, where no plant food was applied; although where farm manure was used the wheat yielded twenty bushels, and with manure and fine-ground natural rock phosphate added the average yield of wheat for the thirteen years has been more than twenty-six bushels per acre.
"The acids formed from the decaying organic matter not only liberate for the use of crops the mineral elements contained in the soil in abundance, but they also help to make available the phosphorus of raw phosphate, when naturally contained in the soil, as it is to some extent in all soils, or when applied to the soil in the fine-ground natural phosphate from the mines.
I also plan to apply at least one ton per acre of fine-ground raw phosphate every six years until the phosphorus content of the plowed soil approaches two thousand pounds per acre, after which the applications will probably be reduced to about one-half ton per acre each rotation.
I see from the agricultural papers that some of the experiment stations report good results from the use of fine-ground raw rock phosphate; but they advise using it in connection with organic matter, such as manure or clover plowed under. I am planning to get some and mix it with the manure here under this shed. Do you use commercial fertilizers in Illinois?"
The Bridal Veil and Vernal Falls are famous for their rainbows; and special visits to them are often made when the sun shines into the spray at the most favorable angle. But amid the spray and foam and fine-ground mist ever rising from the various falls and cataracts there is an affluence and variety of iris bows scarcely known to visitors who stay only a day or two.
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