Now, if you will be good enough to turn that crank." "With pleasure.

What an extraordinary piece of mechanism.--" "A little faster." "The momentum--" "A little faster." "Very heavy fly-wheel--" "Just a little faster." "Friction--mechanics--overcome--" "Now as hard as you can, Professor." "Exercise, muscle, but hard work.

The spark,--is it there?
Whew!" and the Professor stopped, exhausted.
It was the repetition of those experiences that sobered the Professor and led him to speak of his work at home, which he feared he was neglecting.

At the last stop he stood in a pool of water and turned the crank without saying anything that would bear repetition.
While touring, look out for glass, nails, and the country mechanic,--of the three, the mechanic can do the largest amount of damage in a given time.

His well-meant efforts may wreck you; his mistakes are sure to.