( 55 ) 



them, I placed before the microfcope, and delivered them to the 

 limner, that he might make a drawing of one of them. 



Fig. 2.6, ORSTVW, reprefents one fide of the Silk-worm's head, 

 with fix eyes placed therein; on view of which, it plainly appears 

 that the eye marked with the letter O, is defigned to view obje6ls 

 diredtly in front ; that marked R, to look a little obhquely forwards, 

 and at the I'am.e time upwards ; the eye marked S, to look on one 

 fide, and at the fame tune a little upwards ; that marked T, to look 

 rather backwards, and alfo obliquely upwards ; the eye marked V, 

 to look entirely backwards ; and that marked W, downwards. And, 

 confideringthat the eyes of thefe creatures are immoveable, the num- 

 ber and pofition of them as before defcribed (fix on each fide), are 

 the bell calculated for enabling the animal to fee all circumjacent 

 obje61s. 



At the fame time, I obferved the teeth or pincers with which the 

 head is provided, and with which this animal bites or chews the 

 leaves it feeds en ; a row or fet of thefe teeth is placed on each 

 fide of the head, and they moft exa611y fit into or correfpond with 

 each other. Fig.^j, ABCDE, reprefents thofe teeth which were 

 placed on the right fide of the head, and here may plainly be feen 

 how each tootli has a thicknefs or rifing about the middle of it, in 

 order to give it ftrength, whereas the parts of the teeth between D 

 E, are exceedingly iharp and fine, in order more eft'edlually to cut 

 or chew the leaves : and each of thefe teeth has the fame thicknefs 

 or rifing, both on the infide and outfide. The part reprefented at 

 ABC D, appears very thick in proportion to its fize, but upon more 

 narrowly examiriing it, I found that this thicknefs did not confift of a 

 folid bone, but was hollow within, which cavity probably had been 

 filled by fome kind of mufcle. At A and B, appear two round boney 

 parts, which in my opinion fit into hollow fockets in the head, fo as 

 to give the teeth free and fufficient motion. 



