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THE POPULAR SCIENCE MONTHLY 



Fig. 13. Skulls of three Rabbits, mother (3 and 3u), father (1 and la) and son 

 (2 and 2a). From Publication No. 114, Carnegie Institution of Washington, 



by permission. 



What has already been accomplished in the study of heredity gives 

 us a hopeful outlook for the future. We are gaining a fuller knowledge 

 of its processes, and a knowledge of processes is a first step toward their 

 control. 



