Advanced Geography . A Cypress A large part of theHudson gorge has beenslightly drowned, makinga fine water way far in-land from the seacoast. Nearly three fourths ofa century ago, the longErie canal was built alongthe Mohawk branch ofthe Great Valley, from lake Erie to the Hudson canal furnishes a cheap route of trade between theGreat Lakes and the Atlantic seacoast. Railroads nowfollow closely along the same route. The great port ofNew York owes its growth largely to its position on an excellent harbor at themouth of the Hudson val-ley, where trade can easilybe carried on,

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Advanced Geography . A Cypress A large part of theHudson gorge has beenslightly drowned, makinga fine water way far in-land from the seacoast. Nearly three fourths ofa century ago, the longErie canal was built alongthe Mohawk branch ofthe Great Valley, from lake Erie to the Hudson canal furnishes a cheap route of trade between theGreat Lakes and the Atlantic seacoast. Railroads nowfollow closely along the same route. The great port ofNew York owes its growth largely to its position on an excellent harbor at themouth of the Hudson val-ley, where trade can easilybe carried on, both inlandand across the oceans. Theother gorges which crossthe highland are also usedas lines of travel. Water slowly dissolves lime-stone and thus forms caves orcaverns. There are many ofthese in the Appalachian Cavern of Luray, in the Great Valley of Virginia, is one of the most See picture on page 44- The roofs of caves sometimes fall, making deep gorges; or only a small part may remain standing in the for

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