It is a well-known fact that the liquid content of the cells of

plants contain numerous inorganic substances in solution
It is a well-known fact that the liquid content of the cells of
plants contain numerous inorganic substances in solution. Among
these, not considering oxygen, hydrogen, nitrogen and carbon
dioxide, there are the salts of calcium, magnesium, potassium,
iron, sulphur and phosphorus. The above substances are found in
the cells of every living plant. Other substances like salts of
sodium and silica are also found, but these are not regarded as
essential to the life and growth of plants. They appear to be
present because the plant has not the power to reject them.
Many of the substances named above, are found deposited either
in an amorphous or crystalline form in the substance of the
cell wall. In addition to this, crystals of mineral matter,
having various shapes and sizes, are often found in the
interior of cells. The most common of these interior cell
crystals are those composed of calcium oxalate and calcium
carbonate. Others composed of calcium phosphate, calcium
sulphate and silica are sometimes found. These crystals may
occur singly or in clusters of greater or less size. In shape
they are prismatic or needle-like.


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