[56]. The weight of the mass found at Otumpa, in the Gran Chaco Gualamba, in South America, by Don Rubin de Celis (1783) was estimated at about fifteen tons. A piece from this mass, weighing 1,400 pounds, is now in the British Museum.
[57]. ‘Quarterly Review,’ vol. cix. p. 114.
[58]. ‘History of the Iron Trade.’
[59]. The metal was formerly so scarce in their country that in the times of the Edwards the Scotch were accustomed to make predatory incursions into England for the sake of the iron they could carry off. Now they not only manufacture sufficient for their own use, but actually export above half-a-million tons.
[60]. From the official reports of the International Jury of the Universal Exhibition of 1867 in Paris.
[61]. A coin of Nero, analysed by Arthur Phillips, was found to consist of 81·07 per cent. copper, 1·06 tin, and 17·73 zinc; another, of Hadrian, of 85·78 copper, 1·19 tin, 1·81 lead, 6·43 zinc, and 0·74 iron.
[62]. Kopp, ‘Geschichte der Chemie,’ vol. iv. p.221.
[63]. Lignite, or brown coal, is of more modern origin.
[64]. Vol. cxi. p. 80.
[65]. ‘Edinburgh Review,’ vol. cxi. p. 86.