ACKNOWLEDGMENT 



The tobacco investigations reported upon, in part, in this volume of the 

 University of California Publications in Botany have been made possible in large 

 measure by grants to the Department of Botany by the College of Agriculture 

 of the University from its allotment under the Adams Fund. First made some 

 fifteen years ago, these annual grants were continued until 1921. Two grants 

 have been made by the National Academy of Sciences, from the Bache Fund, 

 for the support of certain aspects of the work. The cost of -field operations 

 having greatly increased, the Research Board of the University of California 

 has for the last three years provided certain funds to supplement the allotment 

 from the Department of Agriculture. 



In addition to the seventeen papers included in this volume, the following 

 articles based upon results obtained in this same series of investigations have 

 been published elsewhere. 



Variation of Flower Size in Nicotiana. T. H. Goodspeed and R. E. Clausen. 

 Proc. Nat. Acad. Sci., vol. 1, pp. 333-438, 1915. 



Parthenocarpy and Parthenogenesis in Nicotiana. T. H. Goodspeed. Ibid., pp. 

 341-346, 191.5. 



Factors Influencing Flower-Size in Nicotiana with Special Reference to Questions 

 of Inheritance. T. H. Goodspeed and R. E. Clausen. Amer. Jour. Botany, 

 vol. 2, pp. 332-374, 1915. 



Hereditary Reaction-System Relations — An Extension of Mendelian Concepts. 

 R. E. Clausen and T. H. Goodspeed. Proc. Nat. Acad. Sci., vol. 2, pp. 240- 

 244, 1916. 



Mendelian Factor Differences versus Reaction-System Contrasts in Heredity. 

 T. H. Goodspeed and R. E. Clausen. Amer. Nat., vol. 51, pp. 31-46 and 

 92-101, 1916. 



A Preliminary Note on the Results of Crossing Certain Varieties of Nicotiana 

 Tabacum. W. A. Setehell, T. H. Goodspeed, and R. E. Clausen. Proc. Nat. 

 Acad. Sci., vol. 7, pp. 50-56, 1921. 



Inheritance in Nicotiana Tabacum. II, The Existence of Genetically Distinct 

 Red-Flowering Varieties. R. E. Clausen and T. H: Goodspeed. Amer. Nat., 

 vol. 55, pp. 328-334, 1921. 



Volume 11 of the University of California-Publications in Botany will contain 

 further articles dealing with the tobacco investigations. 



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