ay and night,
forfeited health, friends, and money to give to the world an idea, and
never lived to receive either gratitude or financial reward, dying
unknown or entirely forgotten. There is something tragic about the
injustice of it. But Watt, I am glad to say, lived long enough to
witness the service he had done mankind and enjoy an honored place among
the great of the world."

"Is the kind of engine Watt invented now in use?" Doris inquired.

"Yes, that is a double-acting or reciprocating engine of a more perfect
type," her father returned. "Mechanics and engineers went on improving
Watt's engine just as he had improved those that had preceded it. It is
interesting, too, to notice that after thousands of years scientists
have again worked around to the steam turbine described so long ago in
the Alexandrian records. This engine, although it does away with many of
the moving parts introduced by Newcomen, preserves the essential
principles of that early engine combined with Watt's later improvements.
To-day we have a number of different kinds of engines, their variety
differing with the purpose to which they are applied. Their cost,
weight, and the space they require have been reduced and their power
increased, and in addition we have made it possible to run them not only
by means of coal or wood but by gasoline, oil, or electricity. We have
small, light-weight engines for navigation use; mighty engines to propel
our great warships and ocean liners; stationary engines for mills and
power plants; to say nothing of the wonderful locomotive engines that
can draw the heaviest trains over the highest of mountains. The
principle of all these engines is, however, the same and for the brain
behind them we must thank James Watt."

"Was it Watt who invented the locomotive, too?" ventured Doris. Her
father shook his head.

"The perfecting of the locomotive, my dear, is, as Kipling says, another
story."

"Tell it to us."

"Not now, daughter," protested Mr. Tolman. "I am far too hungry; and
more than that I am eager to enjoy this beautiful country and forget
railroads and locomotives."

"Did you say you were hungry, Henry?" asked Mrs. Tolman.

"I am--starved!" her husband said apologetically. "Isn't it absurd to be
hungry so early in the day?"

"It is nearly noon, Dad!" said Steve, glancing down at the clock in the
front of the car.

"Noon! Why, I thought it was still the middle of the morning."

"No, indeed! While y