a 
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BS 
J. 8. Diller—Fulgurite from Mt. Thielson, Oregon. 253 
_ ing from a tree struck by lightning, so that in this case, as well 
as in the one noted many years ago (1790) by Priestly, their 
electric origin is clearly indicated.. Each of the two fragments 
is about 50 centimeters long, and the diameter of the tube 
varies from 7 to 15 millimeters. The smaller one retains its 
Scope it appears for the most part perfectly clear and amor- 
phous. There is rarely seen a light brown 
_ gurite was produced by the electric fu Rem of 
( sion. Remnants 
quartz grains may be discovered in the colorless glass, but they 
are not abundant 
fetid limestone. In all of these cases the fulgurite occurs as a 
* Since this article was written the author has ascended Mt. Shasta, Cal., and 
found upon its summit fulgurite in the form of incrustations and lightning-tubes. 
