LECTURE IX. 87 



limbs. In the Libellulas or Dragon-Flies it is loco- 

 motive, as in the Locust tribe, but differs most 

 widely from the appearance of the complete insect, 

 and may be numbered among the most singular of 

 the whole. I should here observe that the Lin- 

 nasan term Pupa, which most modern entomolo- 

 gists substitute for that of chrysalis, was given 

 from the indistinct resemblance which many in- 

 sects bear in this state to a doll, or a child when 

 swathed up according to the old fashion. 



From the Pupa or Chrysalis emerges at length 

 the complete insect, in its perfect or ultimate form, 

 from which it can never after change, nor can it 

 receive any further increase of growth. This last 

 or perfect state of an insect is in the Linnsean lan- 

 guage the Imago. 



This surprising alteration of shape during the 

 different periods of an Insect's life is to be con- 

 sidered as an evolution, or successive display of 

 parts before concealed, and which lay masked 

 under a different shape. Swammerdam persuaded 

 himself that he could demonstrate all the parts 

 of the future Butterfly, even in the body of the 

 Caterpillar itself; and though this has been some- 

 times called in question, yet it may be easily cOn* 



