Show weathering of coal it Is probably not generally known that lint coal excused to tile the chemical hei junges lunges greatly its ita quality moisture Is the ino ini st powei powerful ful agent in buch Ii siges it is a matter of cumagun knowledge aifong bieu engaged lu ill tin tile lu alIng nf ill illuminating gas that coal unit lilt lias has bemi been iture iJ for a long time thul expel nines a loss ul of und and tile of u tile hie liziie change tile ma in a diminution of tile volume ur or tile the coat coal und and lu in a luss loss of nu lulng aig power in the gas as produced prud from it such sikh chemical changes occurring in gibat masses of coal way luny even produce sufficient clent accumulation of heal beat to cause spontaneous combustion |