Of the Barnacle; 



I have nothing more to add con- 

 cerning thefe , Animals, but to re- 

 peat the Obfervation which I have 

 already made in the Introduction to 

 this Effay, relating to the Analogy 

 there feems to be betwixt thefe Sea- 

 Produdions, and Mr. Lewenboeclzs 

 microfcopical Wheel-Animals, of 

 which he has alfo difcovered two 

 Sorts ; one that is found in leaden 

 Gutters, which, when difturbed, re- 

 trad: the Wheel-work within their 

 Body; and another upon Duck-weed,, 

 which not only withdraw their Wheel- 

 work within their Bodies, but their 

 Bodies alfo within a Sheath. I need 

 not repeat the Particulars, which I 

 have already advanced in my Intro- 

 duction, by which I have endeavoured 

 to make it probable, that this feem- 

 ing Wheel- work is in EfFed nothing 

 more, than the Play of a Groupe 

 of Horns : I am however perfuaded, 

 that if what I have taken Notice 

 of already in the foregoing Defcrip- 

 tions be duly confidered, and a due 

 Allowance made for the Minutenefs 

 of Mr. Lewenhoeck's Animalcules, of 

 which our be ft Magnifiers give but 

 m knperfed View, moft of the ob~ 



fecvedt 



