Show causes of willo will o th ewis ignis fatrus is the name op applied plied to the pale flame also called will athe wisp and jacko jack o lantern sometimes seen flickering over marshy ground and it is said over churchyards no entirely satis fac tory explanation of the phenomenon has been advanced but it Is i generally believed that the th effect it is due to the spontaneous ignition of gases especially methane or marsh gas aa cha produced by the disintegration of dead plant and possibly animal motter matter |