150 Biology in America 



and sinew of living creatures may we trace the ways of evo- 

 lution, whose workings "declare the glory of God." Many 

 indeed are the blank pages in the record, which must be left 

 for the future to fill in ; but in spite of all the gaps the voices 

 of rock and flower, of the "bird of the air" and the "beast 

 of the field" tell the same story a tale of attempt and 

 achievement, of progress and of promise for the days which 

 are to be. 



