GENERAL REFERENCES 
Borthwick, H, A, 
1947, Daylength and flowering. In 
Science in Farming, U.S. 
Dept. Agr. Yearbook 1943- 
47, pp. 273-283, 
Borthwick, H, A, 
1953. Photoperiodism: the dark 
secret; how nights and lights 
affect plant growth. Elect. 
on the Farm Mag, 26: 11-13. 
Borthwick, H. A. 
[In press] Effect of light on 
flowering and production of 
seed. In. Us. Dept... Agr. 
Yearbook 1961. 
Brown, F,A., Jr. 
1959. Therhythmic nature of plants 
and animals. Amer. Scientist 
47: 147-168. 
Butler, W. L., and Downs, R, J. 
1960. Light and plant development. 
Sci. Amer, 203: 56-63. 
Hendricks, S. B. 
1956. Control of growth and re- 
production by light and dark- 
ness. Amer. Scientist 44: 
229-247, 
Hendricks, S. B. 
1957. The clocks of life, Atlantic 
Monthly 200: 111-115. 
hicks, ©. B. 
1957. You can make a plant do 
tricks, Pop. Mechanics Mag. 
108: 81-85, 232-236. 
Kranz, t. band Kranz. J. Ja. 
1957. Gardening indoors under 
lights, 241 pp. Viking Press, 
New York. 
Parker, M, W., and Borthwick, H. A, 
1950. Influence of light on plant 
growth. Ann. Rev. Plant 
Physiol. 1: 43-58. 
Schultz, Peggy. 
1955. Growing plants under arti- 
ficial light. 146 pp. 
M, Burrows & Co., New York. 
U. S. Agricultural Research Service. 
1953. New light on plants. U. S. 
Dept. Agr., Agr. Res. 1: 3-5. 
Veen, R. van der, and Meijer, G. 
1955. Light and plant growth. 161 
pp. Distributed by the Mac- 
Millan Co., New York. [From 
Philips Tech, Library, Hol- 
land. | 
Wassink, E, C., and Stolwijk, J. A. J. 
1956. Effects of light quality on 
growth, Ann, Rev. Plant 
Physiol. 7: 373-400. 
Went, F. W. 
1956. The role of environment in 
plant growth, Amer, Scientist 
44: 378-398. 
Withrow, R. B. (Ed.) 
1959. Photoperiodism and related 
phenomena in plants and ani- 
mals. Amer. Assoc. Adv. 
Se1rsPub. 55; (903i pps 
Zwikker, C. (Ed.) 
1952. Fluorescent lighting. 247 
pp. Distributed by Elsevier 
Press Inc., Houston and New 
York. [From Philips Tech, 
Library, Holland. ] 
