20 AIASS. EXPERIMENT STATION BULLETIN 376 



3. Guterman, C. E. Diseases of lilies. Yearbook, Hort. Soc. of N. Y. 

 1930. (lit. cit. pp. 51-102). 



4. Hill, R. C. A survey of the United States bulb industry. U. S. Dept. 

 Agr., Bur. Agr. Econ. 1931. 



5. Hosaka, H. Effect of temperature treatment on the flowering of 

 bulbous plants Liiium japonicum var. insulare. Jour. Hort. Assoc, of 

 Japan, 8:120-133. 1937. 



6. Laurie, Alex, and Chadwick, L. C. Commercial flower forcing. P. 

 Blakiston's Son & Co., Inc. 523 pp. 1936. (lit. cit. pp. 382-383). 



7. Laurie, Alex, and Poesch, G. H. Photoperiodism. The value of sup- 

 plementary illumination and reduction of light on flowering plants in 

 the greenhouse. Ohio Agr. Expt. Sta. Bui. 512:3-37. 1932. 



8. Ogilvie, L. A transmissible virus disease of the Easter lily. Ann. 

 Appl. Biol. 15:540-562. 1928. 



9. Pfeiflfer, Norma E. Development of the floral axis and new bud in 

 imported Easter lilies. Contrib. Boyce Thompson Inst. 7:311-321. 

 1935. 



10. Poesch, G. H. Greenhouse potted plants. Ohio Agr. Expt. Sta. Bui. 

 586:1-60. 1937. 



11. Roberts, R. H., and Struckmeyer, B. Esther. The effects of tempera- 

 ture and other environmental factors upon the photoperiodic response 

 of some of the higher plants. Jour. Agr. Res. 56:633-677. 1938. 



12. Shippy, Wm. B. Factors affecting Easter lily flower production in 

 Florida. Fla. Agr. Expt. Sta. Bui. 312:1-19. 1937. 



13. Tilford, Paul E. Diseases of ornamental plants. Ohio Agr. Expt. 

 Sta. Bui. 511:3-79. 1932. 



14. Wiggin, W. W., and Gourley, G. H. Studies on the reaction of green- 

 house soils to the growth of plants. Ohio Agr. Expt. Sta. Bui. 

 484:1-29. 1931. 



15. Withrow, Robert B. Plant forcing with electric lights. Ind. Agr. 

 Expt. Sta. Circ. 206:3-12. 1934. 



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