Ear and Nose 



425 



those states. Some problems on the physiol- 

 ogy of the organs have been studied in 

 animals prepared by techniques of experi- 

 mental embryology. 



The amphibians have served for the greater 

 part of the experiments on the sense organs. 

 Further determination of conditions in other 

 groups would broaden understanding and 

 afford a safer basis for generalizations. Con- 

 tradictions and incomplete observations have 

 been indicated in the discussion. These prob- 

 lems offer good prospect for immediate solu- 

 tions, and the findings are needed to secure 

 understanding of the conditions involved. 



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