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. Behavior in glass-bulb. Fuses and gives off water having an acid reaction, naphtha and a tarry fluid, which chiefly condense in the neck of the bulb, and leave a light, pulverulent carbonaceous residue. on platinum foil. Fuses, takes fire, and burns with a smoky flame, leaving a carbonaceous residue, which under the blowpipe flame, is quickly consumed, with the exception of the ashes. * * * * * Mineral. Hachettine Formula. C + H. Behavior in glass-bulb. Fuses to a clear colorless liquid, which solidifies on cooling and has a tallow-like smell. on platinum foil. Fuses, takes fire, and burns with a bright flame until entirely consumed. * * * * * Mineral. Ozokerite Formula. C + H.