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"Is it the sun which produces these winds?" "Yes, the extreme heat of the sun between the tropics rarefies the air as the earth turns round, and the trade-winds are produced by the rushing in of the less heated air." "Yes, William; and the trade-winds produce what they call the Gulf Stream," observed Ready. "How is that? I have heard it spoken of, papa."

For example, I know that the heat of the sun during the day rarefies the air over the land, and so causes the wind. You challenge me to prove it. Good! that dish of cold water represents the ocean. I next provide myself with one of our most precious domestic conveniences, a hot-water plate; I fill it with hot water and I put it in the middle of the pie-dish.

It is then that the flowers of this world bloom brightest; that its sun is the most genial; that its clouds are the scarcest; that its fruit is the most delicious; that the air is the most balmy; that its cigars are of the highest flavor; that the warmth and radiance of early matrimonial felicity so rarefies the intellectual atmosphere that the soul mounts higher, and enjoys a wider prospect, than ever before.

Now, as this metal disc is attracted or released by the current coming over the wire, it compresses or rarefies the air between it and the ear-drum of the person to whose oral cavity it is held. In this way the sensation of the same sound as was spoken at the transmitter end is reproduced at the receiver end.

Well, we went on splendidly enough for about a year. Meanwhile I was wonderfully improved in philosophy. You have no idea how a scolding wife sublimes and rarefies one's intellect. Thunder clears the air, you know!

"Is it the sun which produces these winds?" "Yes, the extreme heat of the sun between the tropics rarefies the air as the earth turns round, and the trade-winds are produced by the rushing in of the less heated air." "Yes, William; and the trade-winds produce what they call the Gulf Stream," observed Ready. "How is that? I have heard it spoken of, papa."

Lastly, it is very possible that apples and dry figs exhale some such thing as this, which rarefies and attenuates the heat of the beasts; for some things have a natural tendency as well to weaken as to refresh different creatures.