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THE AMERICAN NATURALIST [Vol. L 



A. H. Sturtevant, who, moreover, on several occasions 

 helped to tide the stocks over critical periods during which 

 it was not possible for the author to carry on the work. 

 Thanks are also due to C. B. Bridges, for supplying sev- 

 eral multiple stocks as well as for the use of a number 

 of mutants which he had already located but an account 

 of which he has not yet published. 



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