Louvre, the protection of the, from lightning 80 ———— the first public building in France fitted with lightning-conductors 80 M McTaggart (F.), his opinion of lightning-conductors 92 Magnetisation of metals by lightning 56 Magnetism and lightning, the connection between 56 Majendie (Major), report on the destruction by lightning of the powder magazine, Victoria Colliery, Burntcliffe 147 Marly-la-Ville, Dalibard’s electrical experiments at 20 Matthiessen (Professor), his researches on the conductivity of copper 109 Maxwell (Professor Clerk, F.R.S.), his theory of lightning protection 164 Melsens (Professor), his system of lightning-conductors at the Hotel de Ville, Brussels 111 Merton College Chapel, Oxford, struck by lightning 182 Metals as conductors of electricity 49–61 Metals, the different conductivity of various 50–55 Michel (R. F.), his modified terminal-rod 132 Mineral oil-tanks, the protection of, from lightning in America 138 Monks, Carthusian, electrical experiments made on 6 Musschenbroek (Peter Van), his researches on electricity 4, 5 N Newall (R. S., F.R.S.), his copper-rope manufactory 110, 142 ———— on the church at Laughton-en-le-Morthen being struck by lightning 153, 154 Newall’s system of protecting buildings from lightning 140 ———— copper-rope conductors 162, 164 Newbury Church, Massachusetts, struck by lightning 27 New River, electrical experiments made on the 8 Newton (Sir Isaac), his electrical machine 2 Nollet (Abbé), his criticisms on Franklin’s electrical experiments 19, 35 ———— his animadversions on lightning-conductors 35, 37 ———— Franklin’s reply thereto 36, 37 O Oersted (Hans Christian) his researches in electro-magnetism 55, 57 Ohm (Professor), his experiments on the conductivity of metals 53 Ohm’s law 59 Oil, mineral, tanks, the protection of, from lightning in America 138 Orsini family and lightning-conductors 64 Oxford, Merton College Chapel struck by lightning 182 P Padua, the first lightning-conductor in 48