To a part of the liquid filtered from this precipitate, Ammonia was added, which formed a white precipitate, showing that all the Phosphoric Acid was not in combination with Iron.

To another part of the liquid filtered from the precipitate of Phosphate of Iron, Oxalate of Ammonia was added, which formed a white precipitate of Oxalate of Lime.

The liquid filtered from this precipitate, gave on the addition of Phosphate of Soda and Ammonia, a precipitate of Phosphate of Magnesia and Ammonia, showing the presence of Magnesia.

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