Microscopical Essays. 



333 



/3 and t> are beft feen in Fig. 3, where they are entire, not 

 being injured by an unnatural extenfion. 



Of the second and following Rings, to the last. 



Two large dorfal mufcles, A and B, are difcovered in the 

 fecond and four following rings. There are three, A, B, C, in 

 the 7th, 8th, gth, and 10th rings ; four, A, B, C, D, are to be 

 feen at the 11th ring; and five, A, B, C, D, E, at the anterior 

 part of the 12th ring. 



All thefe files, or ranges of mufcles, A, B, C, and E, as well 

 as the garble mufcles, a, b, c, d, appear at hrft fight only as a 

 iingle mufcle, running nearly the whole length of the caterpillar ; 

 but when this is detached from the animal, it is found to confift 

 of fo many diftincl mufcles, each mufcle only the length of one 

 of the rings ; their extremities are fixed to the divifions of each 

 ring, excepting the mufcle a, which at the 6th, ythj 8th, and 

 9th rings has it's infertions rather beyond the divifions. Each 

 row of mufcles appears as one, becaufe they are clofely con- 

 nected at top by fome of the fibres, which pafs from one ring to 

 the other. The mufcles A, B, C, E, from their fituation may 

 be called the right mufcles of the back ; and for the fame reafon 

 the mufcles a, b, c, and d, may be called the right mufcles of 

 the belly. 



From the third ring the mufcles A, which are twelve in num- 

 ber, gradually diminifh in breadth to the lower part of the laft 

 ring; at the 8th and three following divifions they communicate 

 with the mufcles B, and at the 1 ith with D, In the lower part 



of 



