One would think the ground of this island were hollow, as the rocks sound like vaults when walked on; and indeed the thing is not at all improbable, as the island is much subject to earthquakes. In many places of the island of San Michael there are holes and cracks, out of which there comes a great smoke, and the ground seems as if burnt all around. This is not uncommon also in all the islands, as they all have sulphur mountains. There are also fountains of water so hot as to boil eggs. Three leagues from Angra there is a petrifying spring, which changes wood into stone; and there was formerly a tree having some of its roots in that water, which were stony and as hard as flint. This island produces excellent timber, especially cedar, which is so common that their carts and waggons are made of it, and it is even used as fuel. The island of _Pico_, twelve leagues from Tercera, has a sort of wood called _teixo_, as hard as iron, and of a shining red colour when wrought. It becomes always better and finer as it grows older; for which reason no person is allowed to cut any of these trees, unless for the king's use, and by virtue of a special order from the royal officers. The chief trade of Tercera consists in _woad_, of which they have great quantities. The fleets of Spain and Portugal, bound for the East Indies, Brazil, Cape Verd, Guinea, and other countries, usually come here for refreshments, to the great profit of this and the other islands, the inhabitants selling to them their various articles at good prices. The island of _San Michael_ is seven or eight leagues S.E. of Tercera, and is about twenty leagues in length, having several towns and villages. The capital of this island is _Ponta del Guda_, which drives a considerable trade in _woad_, sent to Tercera, producing about 200,000 quintals[5] every year. This island also produces such abundance of corn, that it is transported to the other islands; but it has no harbours or rivers to give shelter to ships. [Footnote 5: This is perhaps an error for 2000, as the larger quantity would amount to 10,000 tons.--E.]