LITEEATUBE 293 



Packard, C. : The Effect of Radium Radiations on the Development 

 of Chaetoptenis. Biol. Bull., 1918, xxxv. 



Pantel^ J.,and Sinety_, R. de : Sur 1' Apparition des males et d'Hermaph- 

 rodites dans les ponftes parthenogen^tiques des Phasmes. C. R> 

 Acad. Sci., 1908, cxlvii. 



Payne, F. : An Experiment to Test the Nature of the Variations on 

 which Selection Acts. Indiana Univ. Studies, 1918, v. 



PaynE; F. : The Effect of Artificial Selection on Bristle Number in 

 Drosophila ampelophila and Its Interpretation. Proc. Nat. Acad. 

 Sci., 1918, iv. 



Pearl_, R. : The Mode of Inheritance of Fecundity in the Domestic FowL 

 Jour. Exp. Zool., 1912, xiii. 



Rawls, E.: Sex Ratios in Drosophila ampelophila. Biol. Bull., 1913, 

 xxiv. 



Riddle^ 0. : Our Knowledge of Melanin Color Formation and Its Bear- 

 ing on the Mendelian Description of Heredity. Biol. Bull., 1909, 

 xvi. 



Riddle^ 0. : Preliminary Chemical Studies on Male- and Female-Produc- 

 ing Eggs of Pigeons. Science, 1912, xxxv. 



Riddle, Oscar: Sex Control and Known Correlations in Pigeons. Am. 

 Nat., 1916, 1, pp. 385-410. 



Riddle^ Oscar : Success in Controlling Sex. Jour. Hered., 1916, vii. 



Riddle, Oscar: The Theory of Sex as Stated in Terms of Results of 

 Studies on Pigeons. Science, 1917, n.s., xlvi. 



Riddle, Oscar: The Control of the Sex Ratio. Journ. Wash. Acad. Sc, 

 1917, vii. 



Riddle, Oscar: The Theory of Sex as Stated in Terms of Residts of 

 Studies on Pigeons. Science, 1917, n.s., xlvi. 



Robertson, W. R. B. : Chromosome Studies. III. Inequalities and 

 Deficiencies in Homoiogous Chromosomes: Their Bearing upon 

 Synapsis and the Loss of Unit Characters. Jour. Morph., 1915, xxvi. 



Robertson, W. R. B. : Chromosome Studies. I. Taxonomic Relation- 

 ships .Shown in the Chromosomes of Tettigidce and Acrididce: V- 

 shaped Chromosomes and Their Significance in Acrididce, Locustid<s, 

 and Gryllidce: Chromosomes and Variation. Jour. Morph., 1916, 

 XX vii. 



Robertson, W. R. B. : Chromosome Studies IV: A Deficient Super- 

 numerary Accessory Chromosome in a Male of Tettigidea parvi- 

 pennis. Kansas Und. Sci. Bull., 1917, x. No. 14. 



Rosenberg, 0. : Das Verhalten der Chromosomen in einer hybriden 

 Pflanze. Ber. Deutsch. hot. Gessell., 1903, xxi. 



Rosenberg, 0.: Ueber die Tetradenteilung eines Drosera-Bastardes. 

 Ber. deutsch. hot. Gesell., 1904, xxii. 



