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Updated: July 23, 2025
The consequence of their always resorting to the same spot is that, from the voidings of the birds and the remains of fish brought to feed the young, a deposit is made over the whole surface, a fraction of an inch every year, which by degrees increases until it is sometimes twenty or thirty feet deep, if not more, and the lower portion becomes almost as hard as rock.
The consequence of their always resorting to the same spot is that, from the voidings of the birds and the remains of fish brought to feed the young, a deposit is made over the whole surface, a fraction of an inch every year, which by degrees increases until it is sometimes twenty or thirty feet deep, if not more, and the lower portion becomes almost as hard as rock.
Roberts in his book on the "Fertility of the Land," gives an average value of the voidings of a cow for a year as $32.25 and of a horse at $24.06. This is based, of course, upon the collection and saving of all excrements which is never secured except in careful experimentation. The value of manure depends upon the quality of the feed.
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