150 THE SILKWORM MOTH. 



They have, therefore, since then- last change, again 

 added to their weight six-fold. Thus it will be seen 

 that the insect has multiplied its weight more than 

 nine thousand fold. 



It is worthy of remark, that, when the moth has 

 assumed its perfect state, it does not think of using 

 its wings like other winged insects, for it never 

 betakes itself to aerial excursions, and seldom moves 

 beyond a few inches from the spot where it was 

 hatched. 



It will be readily imagined, that this remarkable 

 insect occupies a place in our volume, not ft'om per- 

 sonal beauty, but from the importance of its labours 

 in a mercantile point of view, and its utility to man- 

 kind. 



