454 Twenty-eighth Annual Report 



market a so-called smooth Peruvian alfalfa. However, that the 

 superiority of the true Peruvian variety is now generally recog- 

 nized by the public is reflected in the fact that purchasers are 

 willing to pay approximately double the price of ordinary seed to 

 dealers who can guarantee to furnish seeds of the true Hairy Peru- 

 vian alfalfa. 



In order to meet the demand for information concerning Hairy 

 Peruvian alfalfa this department has gathered together the results 

 of its experiments and experience with this variety in the last eight 

 vears to be published as Timely Hints for Farmers No. 132. Those 

 desiring copies of this publication may obtain same by addressing 

 the Arizona Agricultural Experiment Station. 



BEANS 



Investigational work with beans during the past season has 

 been confined to genetic studies. Hybrids of the third generation 

 have now been secured and they furnish material for the biological 

 analysis of the varieties entering these crosses whereby the genetic 

 formulae of each are being resolved and tabulated. When the 

 genetic formulae of agricultural varieties of plants in general can 

 be written in much the same manner as the chemical formulae of 

 organic compounds, the basis of a rationale for constructive plant 

 breeding will have been laid. 



Owing to the great demand for information concerning the 

 culture and varieties of Southwestern beans and teparies, the orig- 

 inal editions of the two publications (Bulletin No. 68, Southwestern 

 Beans and Teparies and Timely Hint No. 92, The Tepary, A New 

 Southwestern Legume) relating to this subject were quickly ex- 

 hausted. To meet this demand Timely Hint No. 92 was revised 

 and reprinted April 20, 1914, and later to fill the need for more 

 detailed information Bulletin No. 68 was enlarged to include ex- 

 perimental and other data relative to beans and teparies, which' 

 have accrued in the last few years, and republished January 15, 1918. 



The tepary bean, first introduced by the Arizona Experiment 

 Station, has now become well established in the agricultural and 

 seed trade. The common stock is now, however, beginning to be 

 replaced by an improved variety (No. 17) which was produced by 

 selective breeding by this department. Those desiring seeds of 

 this new variety may obtain a list of the growers of the same by 

 addressing this department. 



