460 ANNUAL llEl'ORT SMITHSONIAN INSTITUTION, 1937 



even in strong concentrations, and its effectiveness in stimulating 

 healing make urea an unusually interesting therapeutic agent. One 

 might conjecture what its effect might have been had it been used 

 during the World War. If allantoin sales do begin to diminish, one 

 need not look far for a cause — the qualities of its extraordinary chemi- 

 cal associate, urea 



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