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1921. A study of partial sterility in certain hybrids. Genetics, vol. 6, 



pp. 311-365. 



Garner, W. W. and Allard, H. A. 



1920. Effect of the relative length of day and night and other factors of 

 the environment on growth and reproduction in plants. Jour. 

 Agr. Ees., vol. 18, pp. 553-606. 



Garner, W. W. and Allard, H. A. 



1922. Photoperiodism, the response of the plant to relative length of day 



and night. Science, n.s., vol. 55, pp. 582-583. 



Gleason, H. a. 



1919, Variability in flower number in Vernonia mussurica Eaf. Am. Natur- 

 alist, vol. 53, pp. 526-534, 



GooDSPEED, T. H. and Clausen, E. E. 



1915. Factors influencing flower size in Nicotiana with special reference 

 to questions of inheritance. Am. Jour. Bot., vol, 2, pp, 332-374, 



Goodspeed, T. H. and Clausen, E. E. 



1918. An apparatus for flower measurement, Univ. Calif. Publ. Bot., 

 vol. 5, pp. 435-438. 

 Hayes, H. K. 



1912. Correlation and inheritance in Nicotiana tabacum. Conn. Agr. Exp, 

 Sta. Bull. No. 171, 

 JUEL, H. O. 



1905. Die Tetradteilungen bei Taraxacum und anderen Cichorieen. K. 

 Svenska Vetenskapsakad. Handl., Bd. 39, no. 4, pp. 1-21, 

 Klebs, George 



1918, tJber die Bliitenbildung von Semperviintm. Jena. Festschrift zum 

 Ernst Stahl, pp. 128-151. (Abstract in Bot. Gaz., vol. 67, p. 445.) 

 Rosenberg, O. 



1909. Zur Kentniss von den Tetradteilungen der Compositen. Svensk 

 Botanisk Tidskrift, Bd. 3, pp. 64-77. 

 Eosenberg, O. 



1918. Chromosomenzahlen und chromosomendimensionen in der Gattung 

 Crepis, Arkiv for Botanik, Bd. 15, no. 11, pp. 1-16, 

 Schmidt, Jos. 



1918. Investigations on Hops: XI. Can different clones be characterized 

 by the number of marginal teeth in leaves? C. E. des Travaux 

 de Laboratoire de Carlsberg, Kj0benhavn, vol. 14, pp. 1-22. 

 Shull, G. H. 



1914. Duplicate genes for capsule form in Bursa bursa-pastoris. Ztschr. induk- 

 tive Abstamm. u. Vererbungslehre, vol. 12, pp, 97-149, 

 Shull, G, H, 



1918, Duplication of leaf-lobe factor in the Shepherd's Purse. Mem. 

 Brooklyn Bot, Garden, vol. 1, pp. 427-443, 

 DE Smet, Edmond 



1914. Chromosomes, prochromosomes, et nucleole dans quelques dicotylees. 

 La Cellule, vol, 29, pp, 335-377. 

 Stout, A. B. and Boas, Helene M. 



1918. Statistical studies of flower number per head in Cichorium intybus: 

 kinds of variability, heredity, and effects of selection. Mem. 

 Torrey Bot. Club, vol. 17, pp. 334-458. 



