he simple forms of machines. The lever, the
wedge, the inclined plane--Father--and here we come to further consider
the application of this principle, my dear Charles, to what is known
as the differential wheel and axle. Um Charles--Father--Charles.
Father." (_He looks up despairingly at_ MARY.) No good, my dear. Out
of date. (_He, however, resumes reading the book carefully._)

KATE (_nudging_ MARY, _and pointing to door into rooms_). She's going
into all the cupboards and drawers, and looking at everything. (_She
turns to go back and opens the door to pass through._) I never seen
such a woman.

MARY (_raising her voice so as to let_ SARAH _hear her_). Just keep an
eye on her, Kate, and see she doesn't take anything.

DANIEL. I might get something out of this. Atmosphere. Pressure.

MARY. Uncle Dan. (_He pays no attention, but is absorbed in the
book_). Uncle Dan, I'm going down the loaning a pace. Alick said he
might be back, and I think--(_she sees he is not listening, and slips
back to look over his shoulder._)

DANIEL (_reading_). Charles. And now my dear father, after discussing
in such clear and lucid terms the use of the barometer, and how it is
constructed, could you tell me or explain the meaning of the word
"pneumatic."

MARY (_going towards yard door_). Good luck, Uncle Danny. I'm away.
(_She goes out._)

DANIEL. There's not much here about bellows. (_Hopelessly._) I wish I
had made up this subject a little better. (KATE _comes in evidently
much perturbed and angry._)

KATE. The divil take her and them remarks of hers. Who gave her the
right to go searching that way, I wonder? Where's the silver kept, and
was it locked, and how many spoons was there, and why weren't they
better polished; and part of the china broke.

SARAH (_coming to door and speaking. As soon as_ DANIEL _hears her
voice he hurriedly retreats across to the workshop._) Where do you
keep the knives and forks?

KATE. You don't want forks for the tea.

SARAH. I want to count them.

Kate (_in amazement_). Oh, God save us! You'd think there was a pross
on the house! (_She follows_ SARAH _in through door_ MACKENZIE _comes
in, followed by_ JOHN, _then_ ANDY.)

MACKENZIE. And it was a great idea, you know. The steam passed through
the condenser, and the exhaust was never open to the atmosphere.

JOHN (_evidently much impressed, and repeating the word in a wondering
manner_) Aye. The exhaust!

MACKENZIE. Aye. The exhaust. But now