PLANT STRUCTURE 



149 



113. Efficiency of morning light as compared with after- 

 noon light. Experiments made at the Massachusetts 

 Agricultural College seem to prove that morning light is 

 more efficient than afternoon light. In Bulletin No. 144, 

 of the Massachusetts Experiment Station, on the " Rela- 

 tion of Light to Greenhouse Culture/' George E. Stone 

 writes as follows: " Mr. Alexander Montgomery, of the 

 Waban Rose Conservatories, Natick, Mass., and a very 

 skilled observer of plants, has for years believed in the 

 superiority of morning over afternoon light, and many of 

 the Waban rose houses were purposely placed fourteen to 

 twenty-two degrees north of east instead of exactly east 

 and west. In this position, the houses are tilted towards 

 the sun, and the plants receive the morning sun more di- 

 rectly, which also makes it possible to syringe thoroughly." 



TABLE I, SHOWING DIFFERENCE BETWEEN MORNING AND AFTER- 

 NOON LIGHT IN THE GREENHOUSE. EXPOSURE FROM 9 A.M. TO 

 12 M. AND 12 M. TO 3 P.M. 



