The two side cascades represent the Atlantic and Pacific Oceans.

Josiah sez in a kinder patronizing way, "They're likely Cascades, but I can't see in what way they represent oceans." And I sez, "It hain't _for_ you to know everything, Josiah, you hain't expected to.

Such knowledge would be more than you with your small frame could stand up under." "Oh, keep throwin' my size in my face.

It's a pity I hain't a giraffe, then mebby I'd suit you." And he added snappishly, "I'll bet you can't tell yourself how they look like oceans." And I sez, "I wuz never any hand to tell all I knew, I always thought it wuz best to keep one story back." But to tell the truth I couldn't see how they represented oceans, only they wuz both water, but so is a teacupful of water, or a spunful.
Another way they differed from the ocean, the water hain't there all the time, only once in awhile.

Josiah, bent on findin' fault, sez: "Pretty oceans they be! Dry land most all the time." But I sez, "I've always wished the Atlantic would dry up long enough for me to go over afoot or with the old mair, like the Israelites over the Red Sea, I'd start to-morry." I'm afraid of deep water.