346 ANNUAL OF SCIENTIFIC DISCOVERY. 



Michael's Mount. The ingot weighs 120 pounds, and the form of 

 the under-surface is such as to adapt it for resting on the bottom of a 

 boat. He believed, with Sir Charles Lyell, that in more ancient 

 times, previous to the Roman occupation of Gaul, tin was conveyed 

 to the Mediterranean round the coast of Gaul and Lusitania, but 

 more recently, as Diodorus Siculus states, it was carried by land 

 after crossing the narrow part of the channel. He did not believe 

 that there had been any submergence and re-elevation of the land in 

 Cornwall, but that the marine sediment covering the mines was in 

 existence when tin was originally worked, the ancient miners having 

 bored through the alluvium to get at it. St. Michael's Mount was 

 the Cassitorides of the ancients, and not the Scilly Islands, where 

 there is not a particle of tin. -The miners of the present day some- 

 times find bronze weapons in old tin works. It is not necessary to 

 assume that these were imported, as there is plenty of copper in Corn- 

 wall. The speaker believed they were manufactured there, and that 

 a vast proportion of the bronze weapons of antiquity were actually 

 made in Cornwall and exported. 



