FOOTNOTES:

[90] Al₂Cl₆ + 3Na₂S₂O₃ + 3H₂O = Al₂(HO)₆ + 6NaCl + 3S + 3SO₂

[91] 3BeO,Al₂O₃,6SiO₂

[92] CaC₂O₄ = CaCO₃+CO.

[93] Resolved into two with a powerful spectroscope.

[94] Ammonium compounds are frequently produced when dissolving metals in nitric acid; or when nitrates are heated in the presence of the metals.

PART III—NON-METALS.