340 Plant-Breeding 



1906. SPERLING, J., Korrelation zwischen Kornfarbe und Aehren- 



formen beim Roggen. Fuhlings landw. Zeitung, 55 : 93-99. 

 1906. STUART, W., Disease Resistance of Potatoes. Vermont 



Agr. Exp. Sta. Bull. 122: (see pp. 107-136). Abstr. in 



Exp. Sta. Rec. 17 : 1078. 

 1906. VAN DEN HEEDE, A., Variation chez les vegetaux. Soc. 



Nantaise d'hort. Ann. 79 : 97-103. 

 1906. VRIES, H. DE, Aelters und neuere Selektionsmethode. 



Biol. Centralbl. 26 : 385-395. 

 1906. VRIES, H. DE, Die Svalofer Methode zur Veredelung land- 



wirtschaftlicher Kulturgewachse und ihre Bedeutung fur 



die Selektions-Theorie. Arch. Rassenbiol. 3 : 325-358. 

 1906. VRIES, H. DE, Species and Varieties; their Origin by 



Mutation. Second edition, xviii + 847 pp. 

 1906. WEBBER, H. J., New Citrus and Pineapple Productions 



of the Department of Agriculture. U. S. Dept. Agr. Year- 

 book, 329-346. 8 pis., 1 fig. Same. Yearbook Separate, 



427:329-346. 8 pis., 1 fig. 

 1906. WEISMANN, A., The Evolution Theory. Translated with 



the author's cooperation by J. A. & Margaret R. Thomson. 



2 vols. xvi +416 pp. and 405 pp. E. Arnold. London. 



Rev. in Am. Nat. 40 : 375-377. 

 1906. WIANCKO, A. T., Corn Improvement. Indiana (Purdue 



Univ.) Agr. Exp. Sta. Bull. 110 : 79-120. 14 figs. 

 1906. WILBRINK, G., Deuxieme rapport sur les experiences de 



selection faites avec I'indigotier de Natal. (In Dutch.) 



Buitenzorg (1906), 1-20. 

 1906. WILSON, E. B., Mendelian Inheritance and the Purity 



of the Gametes. Science, n.s. 23: 112-113. 

 1906. WILSON, EDMUND B., Studies on Chromosomes. III. The 



Sexual Differences of the Chromosome-groups in Hemiptera, 



with Some Considerations on the Determination and Heredity 



of Sex. Jour. Exp. Zool. 3: (No. 1). Rev. in Arch. f. 



Entwick'mech. d. Org. 21 : 357. 



