LITERATURE CITED. 



(1) Anonymous. 



1916. Cotton experiments, 1916. Miss. Agr. Exp. Sta. Bui. 178, 40 p., 

 3 fig. (Experiments directed by J. R. Ricks and others.) 



(2) Allaed, H. A. 



1910. Preliminary observations concerning natural crossing in cotton. 



In Amer. Breeders Mag., v. 1, p. 247-261, illus. 



(3) 1911. Some experimental observations concerning the behavior of 



various bees in their visits to cotton blossoms. In Amer. 

 Nat., v. 45, p. 607-S22, 66S-685. 



(4) Andeonescu, Demetrius Ion. 



1915. The physiology of the pollen of Zea mays ... 36 p., 4 pi. 

 [Urbana?] Thesis, Univ. of Illinois. 



(5) Anthony, Stephen, and Harlan, Harry V. 



1920. Germination of barley pollen. In Jour. Agr. Research, v. 18, 



p. 525-536, 2 fig., pi. 60-61. Literature cited, p. 535-536. 



(6) Balls, [W.] Lawrence. 



1909. Some cytological aspects of cotton breeding. In Amer. Breeders' 

 Assoc. Rpt, v. 5, 1908, p. 16-28. 



(7) Balls, W. Lawrence. 



1911. Cotton investigations in 1909 and 1910. In Cairo Sci. Jour., v. 



5, p. 221-234, 2 pi. 



(8) 1912. The cotton plant in Egypt, xvi, 202 p., 71 fig., 1 pi. London. 



Bibliography, p. 181-190. 



(9) Collins, G. N. 



1921. Dominance and the vigor of first generation hybrids. In Amer. 



Nat., v. 55, p. 116-133. Literature cited, p. 133. 



(10) Cook, O. F. 



1909. The superiority of line breeding over narrow breeding. U. S. 

 Dept. Agr., Bur. Plant Indus. Bui. 146, 45 p. 



(11) 1921. Causes of shedding in cotton. In Jour. Heredity, v. 12, p. 



199-204, fig. 3-6. 



(12) McLachlan, Argyle, and Meade, Rowland M. 



1909. A study of diversity in Egyptian cotton. U. S. Dept. Agr., Bur. 

 Plant Indus. Bui. 156, 60 p., 6 pi. 



(13) Darwin, Charles. 



1885. The effects of cross and self-fertilization in the vegetable king- 

 dom, vii, 482 p. New York. 



(14) Dorsey, M. J. 



1919. Relation of weather to fruitfulness in the plum. In Jour. Agr. 

 Research, v. 17, p. 103-126, 1 fig., pi. 13-15. Literature cited, 

 p. 125-126. 



(15) East, Edward M., and Jones, Donald F. 



1919. Inbreeding and outbreeding, their genetic and sociological sig- 



nificance. 285 p., 46 fig. (in text and on pi.) Philadelphia 

 and London. Literature, p. 266-277. 



(16) Emoto, Yoshikadztj. 



1920. Uber die relative Wirksamkeit von Kreuz- und Selbstbefruch- 



tung bei einigen Pflanzen. Jour. Col. Sci. Imp. Univ. Tokyo, 

 v. 43, art. 4, 31 p., 6 fig., 2 pL, 4 tab. 



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