148 Agriculturai. Experiment Station, Ithaca, N. Y. 



dark one. The cauliflower experiment was confined to two dozen 

 plants, however, and we were naturally solicitous to repeat it upon a 

 larger scale. This repetition we shall now consider. 



The lamp was hung over a house sixty feet long, and it was nine feet 

 above the nearest point in the roof. It was hung midway the length 

 of the house, and beneath it the house was divided by a curtain parti- 

 tion. The lamp was surrounded by a clear glass globe, one side of 

 which was painted a dense black in order to throw the light into the 

 opposite compartment of the house beneath. By an arrangement of 

 roof curtains, iu connection with the moveable partition and the black- 

 ened globe, one compartment was kept dark at night, while the other 

 was well lighted. In the day time, the partition Avas withdrawn so 

 that both compartments received equal conditions of heat and ventila- 

 tion.* The central bed of the house, eight feet wide, was used for the 

 cauliflowers in this experiment. The bed is solid; that is, a ground 

 bed, having no bottom heat. Cauliflower seeds of three varieties — 

 Extra Early Dwarf Erfurt, Gilt Edge Snowball, Early Snowball — 

 were sown in " flats " or shallow boxes, August 24th. The plants were 

 set in the bed October 4th, at which time they were about six inches 

 high. The electric light was started a Aveek later, October 11th. The 

 light ran on an average from five to six hours each night. The follow- 

 ing record shows the exact hours of light throughout the experiment: 



Oct. 11 to 15,lightranfrom5:30 to 11 r.M., or 54^ hrs. each night. 



16, " " (i toll or 5" " " 



IV to 20, " " 5:30 to 11 or 5^ " " 



21, " "6 toll or 5" 



22 to 24, " " 5:30 to 11 or 5| " " 



25 to 28, " " 5 toll ore " " 



29 to Nov. 5, " " 5 to 6:30 or 1^ '* " 



6, 



V, " "5 to 9 or 4 " " 



8, " " 5 to 10 or 5 « ' « 



9 to 20, " "5 toll ore " " 



21, " " 4:45 to 11 ore} " " 



22 to 25, " " 5 toll ore " " 



26, 



27 to 29, " "5 toll ore " " 



30, " " 5 to 9 or 4 " " 



Dec. 1, " " 4:30 to 11 or 6^ " " 



2, " "5 to 1 1 or 6 " " 



3, 



*Tho lamp was hung in tlie same position as sliown in the ilhistration on 

 page 135 of Bulletin 43, except that it was a few feet higher. House A B 

 considerably reiuodelled inside, was used for the experiment. 



