CONTENTS OF THE PUPA-CASE. 231 



antennae, however long or fine, have their cases, or 

 sheaths ; even the eyes are provided with them. 

 They exist also upon the trunk, wings, and legs, 

 and tongue, or proboscis. These cases must not 

 be mistaken for the general outer case which 

 covers the whole insect; they are separate from 

 that, and cover the organs in question closely, 

 after the manner of a glove. 



If we were to open a pupa within a few hours 

 after it had assumed this state, we should find its in- 

 terior filled with a milky fluid, in the midst of which 

 its future limbs and organs are seen very distinctly, 

 but are as yet in a most fragile, or even half fluid 

 state. At a little later period this fluid disappears, 

 and hardens into a sort of glue, which partly fastens 

 down the tender limbs into their proper position 

 until the appointed time comes for the insect to 

 burst from its sleep and live, and from which the 

 case which covers them is formed. From the ac- 

 count thus given of the contents of the pupa-case, 

 it will be apparent that the pupa possesses, when 

 perfect, all the organs of the complete insect, head, 

 eyes, antenna, wings, legs, &c,, and is in fact only 

 different from it in that it is still inactive to a great 

 extent, and still a prisoner within its cell of mem- 



