Greenhouse Notes. 



149 



Dec. 



Jau. 



100 days; 484|^ hours of light; average for each night, 4.8 hours. 



The lamp was the same pattern as that used for two preceding 

 winters, a 10 ampere 45 volt Westinghouse alternating current lamp 

 of 2,000 nominal candle power. 



The first heat was turned on the house October 25th. About this 

 time some difference began to be noticed in the size of the plants in 

 the two compartments, those in the light being ahead. On November 

 1st the plants in the light compartment were fully ten per cent larger 

 than in the dark or normal room. The plants in the light gained 

 slowly but steadily over the others in height and general appearance, 

 but it was noticeable that they began to head later than the others. 

 This fully corroborates the results secured from the small experiment 

 of the year before. On December 9th there were 19 heads forming in 

 the dark compartment, and only 12 in the other. The first cauliflowers 

 were picked January 13th, and the harvesting continued at intervals 

 for a week. The measurements of the plants at harvest were as follows: 



