Show Glass Thunderbolts An exhibition of at petrIfied thunderbolts thunderbolts thunder bolts bolts' may be viewed by visitors to the American Museum of at Natural history in New York Technically they tIley are known as and the oft officials of the museum e have decided that there are several se million persons In the United United Unit Unit- United ed States tJI that t have ha worried along for foi years jears ears without knowle knowledge ge of es Dr 0 O. E. E Have of the museums museum's department de de- de- de of geology explained that a n is a glass which Is often otten produced when lightning strikes amass n a mass of or rock or a n bed of at dry sand and melts the material beneath the Impact In other words It Is glass made by nature in very ery much the same way that then men make e glass In glass foun foun- dries The in the museum come cone from all alJ sorts soils of places places Mt Ararat the desert of Sahara Michigan Michi Michi- grin gan Il Illinois and l |