208 



Agkioultural Experiment Station, Ithaca, N. Y. 



of three and one -half inches, while none were visible in the light 

 house. It was a week later that heads began to appear in the 

 light house, or two weeks after they had been observed in the 

 otlier plants; and at this time it was plain that the lighted plants 

 were running to length, whUe the othei's were stocky. ^\Tien the 

 plants were cut, February twenty-ninth, the measurements were 

 as follows: 



These figures show that decidedly better results were obta,ined 

 in the dark house; and it should also be said that more heads 

 wei'e obtained in that house. These results are unequivocal, but 

 the plants under experiment were so few that general conclusions 

 can not be drawm. It is expected that this experiment will be 

 repeated upon a much larger scale the coming winter. 



Flowers. — Violets and daisies were grown upon bench 2. In 

 both instances, strong plants were set in the beds a few days 

 before the light started. The violets (Marie Louise) were all set in 

 the light house near the partition — Ijwelve to sixteen feet from 

 the lamp — and they received the full benefit of the light. Half 

 of the bed of 100 i)lants was covered each night with a black 

 eiuimel-cloth box, provision being made for ventilation, and the 

 other half received the light. Three weeks after the light started 

 the exposed plants began to bloom, while no buds could be found 

 in the darkened portion. It was not until five weeks after the 

 starting of the light that a flower appeared in the darkened plants, 

 while the others had continued to bloom. At this point the 

 obscure violet blight appeared and the experiment with the light 

 ceased. 



Fifty sti'ong plants of the low daisy (Bellis perennis) were 

 divided between the two houses. Those in the light compartment 



