16 INTRODUCTION 



long and the other two nine inches, so that when put to- 

 gether they will form the sides of the box whose top and 

 bottom are the panes of glass. With mucilage or royal 



FIG. 1. Pinning board. Strips of paper hold the wings, a, Cicada; 6, butter- 

 fly ; c, wood-boring beetle ; d, dragon fly ; e, pupa of hawk moth ; /, galley 

 worm. 



glue cement the strips to one pane and let them dry over 

 night, keeping them pressed closely to the glass by the 

 weight of a heavy book. In place of wood, seven or eight 

 strips of thick pasteboard glued one on top of another 



