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Updated: June 7, 2025
It is profitable to buy oyster shell at limestone prices if used liberally enough to furnish a supply for a term of years. The oxide, or burned shell lime, would be nearly the equivalent of burned stone if it did not change to hydrate and air-slaked forms so rapidly that it rarely is on the market in the ~full~ strength of fresh burned lime. Hardwood Ashes.
When the cold has reached this stage it is a pronounced case of roup, and highly contagious. Separate all the ailing fowls and segregate them in comfortable hospital quarters, warm but with one side partly open for fresh air. Disinfect the quarters of the well fowls by spraying with distillate or cheap-grade coal oil and sprinkling the floors and about the houses with air-slaked lime.
If the unburned cores of kilns are ground up, the material simply retains the value of unburned stone. Any air-slaked material put into it has like value. Forkings, ground up, have less value, and sometimes no value at all.
Air-Slaked Lime is a compound formed by the action of carbon dioxide from the air on hydrated lime, and its formula is CaCO3, which is that of pure limestone. Variation in Quality. Limestones vary widely in purity. They were formed under water, and clay and sand were laid down with the lime in such quantity in some cases that the resulting stone is not worth handling for soil improvement.
The cabbage-fly, father-long-legs, the millipedes, the blue cabbage-fly, brassy cabbage-flea, and two or three other insect enemies are mentioned by McIntosh as infesting the cabbage fields of England; also three species of fungi known as white rust, mildew, and cylindrosporium concentricum; these last are destroyed by the sprinkling of air-slaked lime on the leaves.
When everything is taken into account, one is justified in using limestone or air-slaked lime at a cost per ton three-fourths as great as that of lump lime. It is to be borne in mind that in these estimates the cost per ton is not that at the factory or at one's own railway station, but on the farm.
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