III. "Where with chill frown enormous ALPS alarms A thousand realms, horizon'd in his arms; 105 While cloudless suns meridian glories shed From skies of silver round his hoary head, Tall rocks of ice refract the coloured rays, And Frost sits throned amid the lambent blaze; NYMPHS! YOUR thin forms pervade his glittering piles, 110 His roofs of chrystal, and his glasy ailes; Where in cold caves imprisoned Naiads sleep, Or chain'd on mossy couches wake and weep; Where round dark crags indignant waters bend Through rifted ice, in ivory veins descend, 115 Seek through unfathom'd snows their devious track, Heave the vast spars, the ribbed granites crack, Rush into day, in foamy torrents shine, And swell the imperial Danube or the Rhine.-- Or feed the murmuring TIBER, as he laves 120 His realms inglorious with diminish'd waves, Hears his lorn Forum sound with Eunuch-strains, Sees dancing slaves insult his martial plains; Parts with chill stream the dim religious bower, Time-mouldered bastion, and dismantled tower; 125 By alter'd fanes and nameless villas glides, And classic domes, that tremble on his sides; Sighs o'er each broken urn, and yawning tomb, And mourns the fall of LIBERTY and ROME. [_Where round dark craggs_. l. 113. See additional notes, No. XXXII.] [_Heave the vast spars_. l. 116. Water in descending down elevated situations if the outlet for it below is not sufficient for its emission acts with a force equal to the height of the column, as is seen in an experimental machine called the philosophical bellows, in which a few pints of water are made to raise many hundred pounds. To this cause is to be ascribed many large promontories of ice being occasionally thrown down from the glaciers; rocks have likewise been thrown from the sides of mountains by the same cause, and large portions of earth have been removed many hundred yards from their situations at the foot of mountains. On inspecting the locomotion of about thirty acres of earth with a small house near Bilder's Bridge in Shropshire, about twenty years ago, from the foot of a mountain towards the river, I well remember it bore all the marks of having been thus lifted up, pushed away, and as it were crumpled into ridges, by a column of water contained in the mountain.