Microscopical Essays. 207 



circulation of this fluid in the moth is dire&ly contrary to that 

 which took place in the caterpillar ; in this the liquor moved 

 from the tail to the head, whereas in the moth it moves from the 

 head to the tail ; fo that the fluid which anfwers the purpofes of 

 the blood in the moth, goes from the fuperior towards the infe- 

 rior parts ; but in the voracious fenfual caterpillar the order is 

 inverted, it proceeds from the inferior towards the fuperior 

 parts* 



The food of the caterpillar is grofs and folic!, and even this it. 

 is obliged to earn with much labour and danger; but when 

 freed as it were from the jaws of death, and arrived at it's perfecl 

 form, the pureft neftar is it's portion, and the air it's element. It 

 was fupplied with coarfe food, in the firft ftate, by the painful 

 operation of it's teeth, which was afterwards digefled by a violent 

 trituration of the flomach. The interlines are now formed in a. 

 more delicate manner,, and fuited to a more pure and elegant 

 aliment, which nature has prepared for it s ufe, from the moft: 

 fragrant and beautiful flowers. Many internal parts of the cater- 

 pillar difappear in the chryfalis, and many that could not be 

 perceived before are now rendered vifible : the interior changes 

 are not lefs furprizing than thofe of the exterior form, and are 2 

 properly fpeaking, creative of them ; for it is from thefe the 

 exterior form originates, and to thefe it always correfponds. In 

 a word, the creature that heretofore crept upon the earth., now 

 flies freely through the air ; and far from creating our -averfion by 

 it's frightful prickles and foul appearance, it attrads our notice 

 By the moft elegant fhape and doathing,* 



Yon-. 



* Swammerdam's Book of Nature, p. ip. 



