Of the Barnacle, 

 ferved Phenomena may be well ex- 

 plained by the Analogy the Wheel- 

 animals feem to bear to the two 

 Sorts of Barnacles defcribed in this 

 Chapter, but much more fo, if they 

 be compared with Mr. Tremblefs 

 Polypes d pannache, from which they 

 feem to differ in nothing more than 

 Size. Nor can the Appearances of 

 a Wheel revolving round its Axis 

 be explained otherwife, than by fup- 

 pofing it real^ which feems incon- 

 fiftent with the Nature of Animal 

 ©economy* or feeming only by the 

 Play of a Groupe of Horns, fince 

 it is impoffible for it really to re- 

 volve, unlefs, as I obferved before^ 

 it be entirely detached ; in which 

 Cafe, neither can the Animal command 

 its Motion, nor can its Increafe or 

 Subfiftence, as Part of an Animal, be 

 well underftood ; the circular Motion 

 which a Man's Arm is capable of, be- 

 ing fo very different from the Revolu- 

 tion of a Wheel round its Axis, that 

 it fcarce feems to bear even a diflant 

 Analogy to the feeming Wheel- work 

 of thefe Animals. 



H 4 C H A P, 



