INTRODUCTION. 



which is too minute and tranfpa- 

 rent to be (Mindly vifible, yet the 

 Exertion and Retraction of their lit— 

 tie Apparatus of Horns or Arms, 

 which I have often obferved, as welt 

 as their Shape, will appear, I believe, 

 to imply as much to any Perfon, who 

 will be pleafed to obferve them 

 with Attention. 



This Digreffion, I hope, wants 

 no other Apology, than that it was 

 intended as a Hint to the Curious, 

 if they mould think it worth No- 

 tice, to examine the Objects I have 

 mentioned, with more Precilion and 

 Accuracy than I can pretend to, 

 for want of equal Experience in 

 Matters of this Nature. To pro- 

 ceed therefore. 



The ingenious Mr. Baker , F. R.S. 

 in his Natural Hiftory of the Polype, 

 wherein he has moft agreeably en- 

 tertained us with a Variety of Ex- 

 periments, performed in all imagi- 

 nable Ways, that could be contrived 

 for the Satisfaction of the Curious, 

 takes Notice, " that the general 

 " Form of a Polype's Arm , when the 



" Creature 



