Behavior

  in glass-bulb.  Generally gives off water.

  on platinum foil.  Is slowly consumed leaving more or less ash,
                         principally Fe^{2}O^{3}.

* * * * *

Mineral.  Anthracite

Formula.  C + x[.H]

Behavior

  in glass-bulb.  Evolves water.

  on platinum foil.  Is slowly consumed with the exception of a small
                         quantity of ash.

* * * * *

Mineral.  Wallsend-coal

Formula.  C, H, O, S and ash.

Behavior

  in glass-bulb.  Intumesces and gives off water and tarry matters
                         which partly condense in bulb, and leave a
                         porous coke.

  on platinum foil.  Takes fire under blowpipe flame, and burns with
                         a smoky flame, depositing much soot and leaving
                         a porous cinder which burns slowly and leaves a
                         small ash.

* * * * *

Mineral.  Cannel-coal

Formula.  C, H, N, O, S and ash.

Behavior

  in glass-bulb.  As the preceding but gives off more tar.

  on platinum foil.  Similar to the preceding.  If held to the
                         lamp-flame, takes fire and burns for some
                         seconds.

* * * * *

Mineral.  Brown-coal

Formula.  C, H, N, O, S, and ash.

Behavior

  in glass-bulb.  Gives off much water and tar, and leaves a
                         porous cinder retaining the form of the original
                         fragment.

  on platinum foil.  Burns slowly and without flame, leaving some
                         ash.

* * * * *

Mineral.  Asphaltum

Formula.  C + H + O.

Behavior

  in glass-bulb.  Fuses with ease affording an empyreumatic oil
                         having an alkaline reaction, and combustible
                         gasses, and leaves a carbonaceous residue,
                         which is entirely consumed under the blowpipe
                         flame, except a little ash.

  on platinum foil.  Takes fire and burns with a bright flame and a
                         thick smoke.

* * * * *

Mineral.  Elaterite

Formula.  C + H.