"Hush!" said Sandy, giving him a violent kick.
"Don't you want to put your package in the luggage-rack?" said Doctor Gordon, looking over the top of his morning paper.
"No, thank you, sir," said Sandy, growing very red, "it's no trouble to carry."
"I do believe there is something moving about in it," cried Donald, getting more curious and moving nearer. Another kick came from Sandy. But just then the train began to cross the great Firth of Forth bridge, and everything else was forgotten as they all put their heads out to see this wonderful bridge, nearly a mile and a half long.
"Can't you see a castle yonder?" said Doctor Gordon, presently. The boys were on the lookout, and Don soon spied it on its high hill rising above the trees.
"That is Stirling Castle, and next to Edinburgh Castle it is probably the most famous in Scotland," said Doctor Gordon. "Many stirring deeds and brave battles have taken place there in the past."
"Castles were always built on high hills, were they not?" asked Donald.
"Yes, so that they could be more easily protected, and also that a watch could be kept over many miles of country, in order to guard against any surprise by an enemy.
"Over yonder lies the Field of Bannockburn, where was fought one of the greatest battles in the history of Scotland, when Robert Bruce defeated the English, and broke their power in Scotland."