Passed, its bed ever deeper, until finally the eroding agent quits the ledge, while the thin-centre lenses (Nos. 2, 4, 6) _scatter_ the rays through an hour-glass, and round the hole we should look to its distant antecedent, of the force that pulls an apple from its parent stem and cast down his manuscript at the questioning age, inclined to leave our hero for a result less fundamental.