206 Agricultural Experiment Station, Ithaca, IST. Y. 



Decidedly better results were obtained from the sash, directly 

 under the light, for not only were the tubers more and larger, bat 

 the tops were less. 



In no case, however, have radishes been sufficiently benefited 

 to pay the cost of the light; but our results seem to show that a 

 well-protected light is some assistance to them. 



Beets. — Four days before the light started, October fifteenth, 

 seeds of Early Egyptian beet were sown in both compartments, on 

 bench 2. A month later, after 160 hours of light had been 

 expended upon them, the beets in the light compartment were at 

 least one-third larger than those in the dark house. Five months 

 after sowing, the beets were removed, when it was found that 

 fifty-seven per cent of the plants in the light house gave market- 

 able tubers, against only thirty-three per cent of those in the 

 dark house; and the total average weight of the plants in che 

 light was about half an ounce greater than in the dark house. 

 It must be said, however, that the test with beets was hardly a 

 fair one from the fact that the plants in the dark-house received! 

 more bottom heat than the others; but as the results corroborate 

 those obtained from radishes, the figures may possess value. 



Spinage. — When the light was started, spinage was transi- 

 planted into bench 2 in both compartments. This spinage was 

 Round Dutch but it came from three different sources, in which 

 the reader will be interested; and I hope that I may be pardoned! 

 for a short digression to discuss a matter concerning the varia- 

 tion of plants. It will be remembered that in our earlier experi- 

 ments under the naked light spinage ran directly to seed, while 

 plants in the dark house made good edible leaves. This differ- 

 ence is shown admirably in the accompanying figures, which are 

 taken from our Bulletin 30. The slender plant was grown under 

 the light in 1890 and it ran at once to seed ; seeds from this identi- 

 cal plant were saved, and they were sown in plot No. 1 below^ 

 The low plant was grown in the dark house at the same time, and 

 the seeds from it were sown in plot No. 2. Will the characters 

 which these plants assumed under our former experiments be 

 pei-petuated in the offspring? We shall see; and for comparison 

 we shall use commercial seeds in plot No. 3. 



