CONTRIBUTIONS FROM THE NEW YORK 

 BOTANICAL GARDEN— No. 237 



CYCLIC MANIFESTATION OF STERILITY 



IN BRASSICA PEKINENSIS AND 



B. CHINENSIS 



By 

 A. B. STOUT 



NEW YORK 



1922 



Reprinted without change of paging, from 

 The Botanical Gazette, Vol. LXXIII, No. 2, pp. 1 10-13: 



