Mar. 1, 1920 Effect of Length of Day on Plant Growth 605 



(10) The interrelationships between the length of day and the prevailing 

 temperatures of the winter season largely control successful reproduction 

 in many species and their ability to survdve in given regions. 



(11) The relation between the length of the day and the time of 

 flowering becomes of great importance in crop yields in many instances 

 and in such cases brings to the forefront the necessity for seeding at the 

 proper time. 



LITERATURE CITED 

 (i) Abbe, Cleveland. 



1905. A FIRST REPORT ON THE RELATIONS BEWTEEN CUMATES AND CROPS. 



U. S. Dept. Agr. Weather Bur. Bui. 36, 386 p. Catalogue of peri- 

 odicals and authors referred to ... p. 364-375. 



(2) AtLARD, H. A. 



I919. GIGANTISM IN NICOTIANA TABACUM AND ITS ALTERNATIVE INHERITANCE. 



In Amer. Nat., v. 53, no. 626, p. 218-233. Literattu-e cited, p. 233. 



(3) Bailey, L. H. 



189i. some preliminary studies of the influence op the electric arc 

 LIGHT UTON GREENHOUSE PLANTS. N. Y. Comell Agr. Exp. Sta. 

 Bul. 30, p. 83-122, 13 fig., 2 pi. 



(4) 



(5) 



1892. SECOND REPORT UPON ELEctrohorticulturE. N. Y. Cornell Agr. 

 Exp. Sta. Bul. 42, p. 133-146, illus. 



1893. greenhouse notes for 1892-93. I. THIRD REPORT UPON ELECTRO- 

 HORTICULTURE. N. Y. Comell Agr. Exp. Sta. Bul. 55, p. 147-157, 

 2 pi. 



(6) Bonnier, Gaston. 



1895. influence DE la LUMI^RE i&LECTRIQUE CONTINUE SUR LA FORME ET 



LA STRUCTURE DES PLANTEs. In Rev. Gen. Bot., t. 7, no. 78, p. 241- 

 257; "o- 79. P- 289-306; no. 80, p. 332-342; no. 82, p. 409-419. pi. 6-15. 



(7) CORBETT, L. C. 



1899. A STUDY OF THE EFFECT OF INCANDESCENT GAS LIGHT ON PLANT GROWTH. 



W. Va. Agr. Exp. Sta. Bul. 62, p. 77-110, pi. 1-9. 



(8) Flammarion, Camille. 



l898(?). PHYSICAL and meteorological RESEARCHES, PRINCIPALLY ON SOLAR 

 RAYS, MADE AT THE STATION OF AGRICULTURAL CLIMATOLOGY AT THE 



OBSERVATORY OF juviSY. In Exp. Sta. Rec, V. 10, no. 2, p, 103-114, 

 4 fig., 2 col. pi. 



(9) Garner, W. W., Allard, H. A., and Foubert, C. L. 



I914. OIL CONTENT OF SEEDS AS AFFECTED BY THE NUTRITION OF THE PLANT. 



In Jour. Agr. Research, v. 3, no. 3, p. 227-249. Literature cited » 

 p. 249. 



(10) GiROU DE BUZAREINGUES, Ch. 



183 1. SUITE DES EXPERIENCES SUR LA GENERATION DES PLANTES. In Aim. 



Sci. Nat., t. 24, p. 138-147. 



(11) Hoffman, H. 



1882. thermische vegetationsconstanten; sonnen- und schattentem- 

 PERATUREN. In Ztschr. Osterr. Gesell. Met., Bd., 17, p. 121-131. 



(12) 



1886. phAnologisciiE studien. In Met. Ztschr., Jahrg. 3 (Ztschr. Osterr. 

 Gesell. Met., Bd. 21), p. 113-120, pi. 6. 



