Analysis of The Coral Island

His arms were round a chest of oaken wood,
  It was clamped with brass and iron studs, and seemed
An awful weight. After a while he stood
  And I stole near to him.—His white eyes gleamed
As he peeped secretly about; he laid
  The oaken chest upon the ground, then drew
A great knife from his belt, and stuck the blade
  Into the ground and dug. The clay soon flew
In all directions underneath a tree,
  And when the hole was deep he put the box
Down there, and threw the clay back cunningly,
  Stamping the ground quite flat; then like a fox
He crept among the trees.... I went next day
  To dig the treasure up, but I lost my way.