Chap. XII. ^ CONCLUSION. 141 



which raised itself into a life on land, may be recom- 

 mended for further examination. 



Much in what has been adduced above may be erro- 

 neous, many an interpretation may have failed, and 

 many a fact may not have been placed in its proper 

 light. But in one thing, I hope, I have succeeded, — in 

 convincing unjprejudiced readers, that Darwin's theory 

 furnishes the key of intelligibility for the develop- 

 mental history of the Crustacea, as for so many other 

 facts inexplicable without it. The deficiencies of this 

 attempt, therefore, must not be laid to the charge of 

 the plan drawn out by the sure hand of the master, but 

 solely to the clumsiness of the workman, who did not 

 know how to find the proper place for every portion of 

 his material. 



