Errata

page 458: 'shiped'->'shipped'


page 458: 'varities'->'varieties'


page 459: 'Attol'->'Atoll'


page 459: 'discoverd'->'discovered'


page 464: 'thorougly'->'thoroughly'


page 471: 'occasionaly'->'occasionally'


page 518: 'cresent'->'crescent'