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Updated: May 25, 2025
We know with absolute certainty, that in the blood of a young or growing animal there remains a certain quantity of phosphate of lime and of the alkaline phosphates, to be stored up and to minister to the growth of the bones and general bulk of the body, and that, with the exception of this very small quantity, we receive back, in the solid and fluid excrements, all the salts and alkaline bases, all the phosphate of lime and magnesia, and consequently all the inorganic elements which the animal consumes in its food.
Phosphate of lime and magnesia in food principally furnish the animal with the materials of which the bony skeleton of its body consists. Saline substances chlorides of sodium and potassium, sulphate and phosphate of potash and soda, and some other mineral matters occurring in food supply the blood, juice of flesh, and various animal juices, with the necessary mineral constituents.
This seems to exclude the bug as a carrier. The flea is excluded by the fact that in the phosphate mines of Tunis the flea is abundant, and bites both natives and Europeans. Yet when typhus fever broke out among the miners although all were equally bitten by the fleas no European was infected.
The quantity required to decompose the phosphate of iron was not great, and assuming Liebig's theory of its action in liberating the potash to be true, it seemed to me that an excess of lime would permanently impoverish the land; for, supposing that the crop required 100 lbs. of potash, and as much lime was applied as liberated 500 lbs., what became of the 400 lbs. which did not enter into the composition of the plant? was not a large portion of this 400 lbs. washed down the drains by the rain, and so lost for ever?
Here is Ruth, a little growing girl, who wants phosphate of lime to build bones with; for as she grows, of course her bones must grow too. Very well, I answer, there is plenty of phosphate of lime in the earth; she can have all she wants. Yes, but does Ruth want to eat earth? do you? does anybody?
The result is the formation of deposits, chiefly of lime carbonate and lime phosphate; fatty deposits are also common. In order to live long and comfortably it would be well to reduce the starch intake to once a day. The meats also are objectionable when taken in excess. To them can be attributed the chief blame for the formation of gelatinous deposits in the body.
On my own farm I use about one ton per acre of raw phosphate once every six years, thus adding at least 250 pounds of phosphorus at a cost of less than $8; whereas 200 pounds of the common "complete" fertilizer per acre yearly would cost $12 every six years, and would supply only 40 pounds of phosphorus.
But have we decreased our exportation of phosphate? Oh, no.
A specimen of the water, taken near the shore, was brought back to New Haven and analyzed by Dr. George S. Jamieson of the Sheffield Scientific School. He found that it contained small quantities of silica, iron phosphate, magnesium carbonate, calcium carbonate, calcium sulphate, potassium nitrate, potassium sulphate, sodium borate, sodium sulphate, and a considerable quantity of sodium chloride.
A pearl consists of carbonate of lime, in the form of nacre, and animal matter arranged in concentric layers around a nucleus; the solution indicating no trace of any phosphate of lime. To this lamellar structure the irridescence is to be ascribed. Each layer is presumed to be annual; so that a pearl must be of slow growth, and those of large size can only be found in full-grown oysters.
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