46 HISTORY OF CRUSTACEA. Chap. VI. 



fatuus. The higher the structure to be raised, the 

 wider must be the assuring base of well -sifted facts. 



Let us turn then to a wider field, that of the develop- 

 mental history of the Crustacea, upon which science 

 has already brought together a varied abundance of 

 remarkable facts, which, however, have remained a 

 barren accumulation of unmanageable raw-material, 

 and let us see how, under Darwin's hand, these scattered 

 stones unite to form a well-jointed structure, in which 

 everything, bearing and being borne, finds its significant 

 place. Under Darwin's hand ! for I shall have nothing 

 to do except just to place the building stones in the 

 position which his theory indicates for them. " When 

 kings build, the carters have to work." 



