72 ORIGIN OF SOCIETY. CANTO IT. 



Shakes o'er the obedient pairs his silken thong, 

 And goads the humble, or restrains the strong. 



Slow roll the silver wheels, in beauty's pride 



i 



Celestial PSYCHE blushing by his side. 



The lordly Bull behind and warrior Horse 



With voice of thunder shake the echoing course, 



Chain'd to the car with herds domestic move, 



And swell the triumph of despotic LOVE. 370 



** Pleased as they pass along the breezy shore 

 In twinkling shoals the scaly realms adore, 

 Move on quick fin with undulating train, 

 Or lift their slimy foreheads from "the main. 



With undulating train. 1. 373. The side fins of fish seem to be 

 chiefly used to poise them ; as they turn upon their hacks immediately 

 when killed, the air-bladder assists them perhaps to rise or descend 

 by its possessing the power to condense the air in it by muscular con- 

 traction; and it is possible, that at great depths in the ocean the air 

 in this receptacle may by the great pressure of the incumbent water 

 become condensed into so small a space, as to cease to be useful to 

 the animal, which was possibly the cause of the death of Mr. Day in 

 his diving ship. See note on Ulva, Botan. Card. V. II. 



The progressive motion of fish beneath the water is produced 

 principally by the undulation of their tails. One oblique plain of a 



