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Proceedings of the Royal Society 
slanting flash of local and ozone-producing lightning which excited 
the residents on the hill so much at the time.” 
We may probably also assume that the lightning struck at the 
point A. I had already been directed to that point from the 
The hole at “ A,” as it appears on the under surface of the lead ; 
carefully drawn full size by Mr J. M. Corner, wood-engraver. 
similarity of the hole there, to a lightning hole in sand, hut could 
not imagine why the fluid should have pierced a hole through 
a good conductor, viz., a sheet of lead. On mentioning this diflS- 
culty to Professor Tait, he remarked, “ that if the hole was due to 
the immediate action of the spark, I might be quite sure that there 
was a conductor below, which the lightning was trying to get at 
and pass ofi* by,” and after that opinion had been so expressed, the 
lead was lifted at the place (it had previously only been raised at 
B), and the gas-pipe was found precisely there at its closest point 
of approach anywhere to the roof, as may be seen clearly repre- 
