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