THE POLYBIA, 



257 



On the left hand may be seen a nearly spherical nest, which 

 is evidently hollow, and has cells both on the outside and within 

 the cover. These cells are not placed vertically, with their 

 mouths downward, like those of the wasp and hornet, nor 



horizontally like those of the bee, but are set with their mouths 

 radiating from the centre of the nest. Moreover, there is another 

 curious circumstance connected with the nest. If it were to be 

 opened, it would be seen to be composed of several concentric 



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