LECTURE IX. 
87 
limbs. Ill the LibeHulse 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- 
n«an 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 
y 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 j and though this has been some- 
times called in question, yet it may be easily con- 
