SECTION OF A WOODEN NURSERY. 



21 



comes out of the egg, and then piles it up in the 



gallery just over 



the first egg. She 



then, at a height 



of about three 



quarters of an 



inch, plaisters a 



layer or ring of 



saw-dust made by 



her into a sort of 



mortar, and adds 



to this another and 



another ring Of the 



same material until the ceiling is quite complete, 

 and the cell thus formed is shut off from the rest of 

 the excavation by a circular plate of this substance, 

 which effectually excludes all intercourse be- 

 tween the occupants of this 

 wooden nursery. Having 

 completed this cell she pro- 



1-1 i 



ceeds in the same way to lay 

 an egg, and to provide a store 

 of food, and, finally, to close 



* 



in the rest of the gallery, 



until she has subdivided it into ten or twelve 



Cells f Carpenter-Bee. 



/. 



//:/ " 



Ks 





Ceiling -plate 



