Show IllotiuUr 1lhlnlnr llKhtnlug ball are comparatively rare phenomena although there are luanj inorded Instance of their op pcarane > during thunderstorm In s came ot thrlr formation U more cr lei u mystery but soma light has been thrown upon it recently by the export manta of signor Illghl at Dologna He haa succeeded In producing nrllfl clal llthtnl g ball with a powerful i Ilolti eledrlo macblnu and a battery uf Leydcn Jan and hag mad photographs photo-graphs ot them In arlou stage ot thrlr rxlitenre The condition under un-der which be product file mlmlo lightning light-ning are High rctlitance In the dli charging circuit great capacity In the condedier and a rarefaction of the air through which the dlicbarg take place |