head on a long vertical filament. 

 Two or three thus accumulate, and, 

 as a consequence, in his maturer years 

 he looks up to the head he wore when 

 he was a youngster, and ponders on 

 the flight of time and the .hollowness of 

 earthly things, or perhaps congratulates him- 

 self on the increased contents of his present shell. 

 When fully grown, he stops eating, and goes into 

 a new business. Selecting a suitable twig, he 

 gnaws a cylindrical hole to its centre and fol- 

 lows the pith, now and then backing out of 

 the tunnel, and dropping the excavated ma- 

 terial in the form of little balls of saw- 

 dust. At length he emerges from the 

 hollow, and again drawing himself in 

 backward, spins a silken disk across 

 the opening, and tints it with the col- 

 or of the surrounding bark. Here he 

 spends the winter, and comes out in a 

 new spring suit in the following 

 : *sr : -~" May. Only recently I had 



~- - . in my possession several of 



these twigs with their en- 

 closed caterpillars,' and in ev- 

 ery one the color of the silken lid so closely matched the tint of the 



9 



PROFESSOR WIGGLEK. 



