The first verse was written by
Robert Lewis Stevenson for his book
The rest written by Young Ewing Allison.
Click the image for a larger 1200dpi wide version.
Above - Young Ewing Alison
The Movie (DVD) with Charlton Heston!: Treasure Island
The melody for the song as it is below is correct but the chords are
different than on the more complex version of chords found here.
Click on the image to enlarge it for better legibility.