516 ri7^ BRITISH ANGLER, p. I. 



By this Means he pofTefTes a larger Space than 

 he would do without it, and this brings him 

 to an equal Poife with that Body of Water 

 whofe Place he fills. Let us fuppofe the Fifli, 

 without his Bag, to weigh fixteen Ounces, and 

 the Water, whofe Place he occupies, to weigh 

 fifteen only, the Fifh muil unavoidably de- 

 fcend. If, however, you afterwards fupply 

 the Fifh with a fmall Bag of Air, which adds 

 nothing to his Weight, but enlarges his Di- 

 mcnfions, fo that the Mafs of Water, whofe 

 Place he fills, weighs fixteen Ounces ; the 

 Fifli will then be in an equal Poife with that 

 Mafs, and be fupported in any Part of the 

 River. 



Now fuppofing the Fifli to extend his Bag, 

 he muil enlarge the Dimenfions of his Body, 

 without the Addition of any Weight : And if 

 he becomes lighter, he muft confequently rife. 

 On the contrary, /hould the Fifh contradl his 

 Bag, he will decreafe in his Dimenfions, with- 

 out any Diminution of his Weight •, whereby 

 he mull become heavier than the Water whofe 

 Place he occupies, and unavoidably muil fink. 

 How improbable foever this Dillention and 

 Contradlion may feem, they have been evinc- 

 ed by inconteftable Demonflrations. This 

 Bag of his, for the generality, has two fmall, 

 but diftind: Partitions : One, which is always 

 equally full of Air, in order to keep the Fiih 

 in an equal Poife with the Mafs of Water 

 whoff^ Place he fills : The other is dilated or 

 contraded, to enable the Filh to become light- 

 er 



