surrounded by deep water, their removal with explosives was easy,

the shattered fragments being allowed to sink to the bottom and

remain there beneath the danger line.

"Many other great works have also been completed. The canals at

Nicaragua have been in operation many years, it having been found

best to have several sizes of locks, and to use the large ones

only for the passage of large vessels. The improved Erie and

Champlain Canals also enable ships four hundred feet long to