Bramble-bees and Others 



the indefinite variation of their materials. 

 What will the theorists' levers lift with this 

 fulcrum? Why, nothing at all! Whether 

 they cut the delicate petals of the geranium 

 or the tough leaves of the lilac-bushes, the 

 Leaf-cutters are and will be what they were. 

 This is what we learn from the persistence 

 of each species in its structural details, de- 

 spite the great variety of the foliage em- 

 ployed. 



27a 



