"There is enough here to file through an iron bar, if properly used," said Silva, examining it.  "Hand me the nails; I will see what I can do."  Seating himself under the shade of a cocoa-nut tree near the hut, he began working away most assiduously.  With a pair of pincers he twisted the nail into the shape of a hook, and very soon filed, out a barb, and some notches in the shank with which to secure the line.  In the course of two or three hours he had produced a dozen capital hooks. "Now we may go fishing," said he.  "We may catch as many fish as we can want, but we should be the better of a canoe."