Microscopical Essays* 391 



down the future ; there is a band of the fame colour near the 

 apex, and alfo a black point near the bafe ; the whole animal is 

 curioufly covered with hair. Geoffroy fays it is found on um- 

 belliferous plants ; the one here defcribed was found in May ; 

 the natural fize is feen at C. 



Fig. 1 and 3, Plate XIX. reprefents two of the feet of the 

 monoculus apus of Linnaeus. They are curioufly contrived to 

 aflift the animal in fwimming, and form a very beautiful object 

 for the microfcope. 



Fig. 2 and 4 are of the natural fize. 



Of the Scales of Fish. 



The outfide coverings, or fcales, of fifties afford an immenfe 

 variety of beautiful objects for the microfcope. They are formed 

 in the molt admirable manner, and arranged with inconceivable 

 beauty and regularity ; fome are of a long fhape, others nearly 

 round, fome fquare, varying in fhape, not only in different fpe- 

 cies of fifh, but even confiderably on the fame fifh ; thofe which 

 are taken from one part not being entirely fimilar to thofe which 

 are taken from another. 



Leeuwenhoeck fuppofed each fcale to confift of an infinity of 

 fcales, laid one over the other, or more limply of an infinity of 

 ftrata, of which thofe next the body of the fifh are the largeft. 



Thefe ftrata exhibit a fpecimen of very beautiful workmanfhip j 

 when viewed with the microfcope, we find them to be conftrudred 



with 



