Chapter titles are ...(1) Introduction ...(2) The Discharge of Negative Electricity by Hot Platinum in a Vacuum ...(3) The Discharge of Negative Electricity by Hot Platinum in Hydrogen and Other Gases ...(4) The Discharge of Negative Electricity by Various Substances ...(5) The Discharge of Positive Electricity by Hot Bodies ...(6) The Conductivity of the Bunsen Flame ...(7) The Electrical Conductivity of Salt Vapours ...(8) The Electrical Conductivity of Flames for Rapidly Alternating Currents ...(9) Flames in a Magnetic Field.