B. P. I.— 745. 



RESULTS OF COTTON EXPERIMENTS IN 1011. 



INTRODUCTION. 



Even with an annual plant like cotton most experiments have to be 

 continued for several years before the completed results are ready- 

 to be reported. But when the work leads to the recognition of new 

 factors that affect the crop or suggests new methods of agricultural 

 improvement there should be no loss of tune in making the results 

 available for the information of the public or for the use of other 

 investigators of similar problems. These purposes can be served 

 by a brief summary of the principal conclusions that have been 

 reached, especially those that affect general problems of breedmg and 

 crop production. 



The present statement is to be considered as supplementary to that 

 contamed in the Annual Report of the Chief of the Bureau of Plant 

 Industry for 1911. The subjects that have been treated in more 

 detailed publications are also omitted unless further conclusions have 

 been reached. The following subjects have received attention in 

 recent publications of the Bureau of Plant Industry: 



Suppressed and Intensified Characters in Cotton Hybrids, Bulletin ]47. 



A Study of Diversity in Egyptian Cotton, Bulletin 156. 



Local Adjustment of Cotton Varieties, Bulletin 159. 



Origin of the Hindi Cotton, Circular 42. 



Mutative Reversions in Cotton, Circular 5.3. 



Cotton Selection on the Farm by the Characters of the Stalks, Leaves, and Bolls, 

 Circular 66. 



Dimorphic Branches in Tropical Crop Plants: Cotton, Coffee, Cacao, the Central 

 American Rubber Tree, and the Banana, Bulletin 198. 



Hindi Cotton in Egypt, Bulletin 210. 



Relation of Drought to Weevil Resistance in Cotton, Bulletin 220. 



Dimorphic Leaves of Cotton and Allied Plants in Relation to Heredity, Bulletin 221. 



Arrangement of Parts in the Cotton Plant, Bulletin 222. 



BREEDING NEW VARIETIES OF AMERICAN UPLAND COTTON. 



Several of the varieties that have been originated by this Depart- 

 ment and sent out through the Office of Congressional Seed Distri- 

 bution are gaining in popular appreciation and agricultural utility. 

 The distribution of seed is being continuetl in order to permit more 



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