Thirdly, the testimony of electrical engineers who have had large experience with lightning conductors seems almost unanimous that a lightning conductor erected and maintained in accordance with the conditions prescribed by the Lightning Rod Conference gives perfect protection. It was certainly unfortunate that the Hotel de Ville, in Brussels, which was reputed the best protected building in Europe, should have been damaged by lightning just two months before the discussion took place; but no certain conclusion can be drawn from this catastrophe until we know exactly the conditions under which it occurred. So the matter stands, awaiting further investigation. FOOTNOTES: [41] See his Lectures, published in the _Electrician_, June 22, June 29, July 6, and July 13, 1888. [42] See paper read at the meeting of the British Association, in Bath, 1888, published in the _Electrician_, page 607. September 14. [43] See a very ingenious hypothesis, to account for this phenomenon, suggested by Professor Ewing in the _Electrician_, p. 712. October 5, 1888. Transcriber’s Notes Errors and omissions in punctuation have been corrected. Page 11: “continuous inpression” changed to “continuous impression” Page 41: “full conconducting power” changed to “full conducting power” Page 44: “it base” changed to “its base” Page 58: “follow one an-another” changed to “follow one another”