18 



MUTATIVE REVERSIONS IN COTTON. 1 



of flowering, to avoid the contamination of the stock by cross- 

 poUination. 



Partial expressions of Hindi and other inferior characters can often 

 be detected in the hnt and seed, even when not shown in the vegeta- 

 tive characters of the plants. Such tendencies are to be taken into 

 account in the annual selection of seed. 



It is also of practical importance to distinguish between the Hindi 

 variations of the Egyptian cotton and the variations that result from 

 crossing with Upland cotton. If reversions are mistaken for results 

 of recent hybridization it may appear impossible to guard the Egyp- 

 tian or other superior types of cotton from Upland contamination, 

 though there is every reason to believe that distances of a few miles 

 will afford complete isolation. 



Approved : 



James Wilson, 



Secretary of Agriculture. 



Washington, D. C, February 2, 1910. 



[Cir. 53] 



o 



