Now Mr. Mackay was standing looking as though he were trying to find something that he had lost in the road.  If they had been near enough to Alec and his father they would have heard words like these: 

“You see, Alec, this is the Zambesi River running down from the heart of Africa into the Indian Ocean, and here running into the Zambesi from the north is a tributary, the Shire.  Livingstone going up that river found wild savages who ...”

So the father was tracing in the dust of the road with the point of his stick the course of the Zambesi which Livingstone had just explored for the first time.

On these walks with his father Alec, with his blue eyes wide open, used to listen to stories like the Yarn we have read of the marvellous adventures of Livingstone.[50] Sometimes Mr. Mackay would stop and draw triangles and circles with his stick.  Then Alec would be learning a problem in Euclid on this strange “blackboard” of the road.  He learned the Euclid—­but he preferred the Zambesi and Livingstone!

One day Alec was off by himself trudging down the road with a fixed purpose in his mind, a purpose that seemed to have nothing in the world to do with either Africa or Euclid.  He marched away from his little village of Rhynie, where the burn runs around the foot of the great granite mountain across the strath.  He trudged on for four miles.  Then he heard a shrill whistle.  Would he be late after all?  He ran swiftly toward the little railway station.  A ribbon of smoke showed over the cutting, away to the right.  Alec entered the station and ran to one end of the platform as the train slowed down and the engine stopped just opposite where he stood.

He gazed at the driver and his mate on the footplate.  He followed every movement as the driver came round the engine with his long-nosed oil-can, and opened and shut small brass lids and felt the bearings with his hand to see whether they were hot.  The guard waved his green flag.  The whistle of the engine shrieked, and the train steamed out of the station along the burnside toward Huntly.  Alec gazed down the line till the train was out of sight and then, turning, left the station and trudged homeward.  When he reached Rhynie he had walked eight miles to look at a railway engine for two and a half minutes—­and he was happy!

As he went along the village street he heard a familiar sound.

“Clang-a-clang clang!—­ssssssss!” It was irresistible.  He stopped, and stepped into the magic cavern of darkness, gleaming with the forge-fire, where George Lobban, the smith, having hammered a glowing horseshoe into shape, gripped it with his pincers and flung it hissing into the water.

Having cracked a joke with the laughing smith, Alec dragged himself away from the smithy, past the green, and looked in at the stable to curry-comb the pony and enjoy feeling the little beast’s muzzle nosing in his hand for oats.

He let himself into the manse and ran up to his work-room, where he began to print off some pages that he had set up on his little printing press.