236 



The carrots (Shorthorn Scarlet) gave indiftereut results. They did not appear in 

 he affected greatly even by the naked light when growing directly opposite to it 

 and but 3 or 4 feet away. Carrots reiiuirc su<:h a long period of growth that thi' 

 lirst good picking was not obtained until the end of the experiment in April. The- 

 plants therefore grew under both the naked and protected lamps. * * * Tin 

 figures [given in the article] show that the plants which grew directly in front of 

 the lamp were but little inferior to those which stood 10 or 12 feet away, or even to 

 those in the dark house. No other plant in our experiments has withstood the elec- 

 tric light so well. 



Experiments with the naked light running a part of the night. — "From 

 January 16 to May 1, 1891, the experiment was conducted under new 

 ionditions. The arrangement of the house or compartment remained as 

 ])efore, but the hiiiip was connected with a street-lighting- .system and the 

 light ran but a few hours, and never on moonlight nights. In this test 

 we used a 10 ampere 45 volt 2,000 nominal candle power Westinghousc 

 alternating current lamp." The plants experimented with were rad 

 ishes, peas, lettuce, and a variety of ornamental plants, mostly tiilijis. 

 \erbenas, petunias, primulas, heliotropes, and coleus. 



These ornamentals were mostly name<i one-colored varieties, and they were grow ii 

 to enable us to make observations concerning tin- influence of electric light upon 

 rolor. In this experiment the lighting of the conqiartments was reversed durin^^ 

 the last month in order to eliminate any error which might arise from any min- 

 differences in the temperature or other conditions of the two portions of the houM 

 [A detailed tabular record is given of the dates and hours of lighting.] 



Of radishes, the White Box and Cardinal Globe were grown. The folia v;c wm^ 

 noticeably larger in the electric light house, as it had been under the modified lighi. 

 but the tubers were practically the same in both houses, and the dnfc of matiirii\ 

 Avas the same. Notwithstanding its greater size, the foliagr in tin- light hou>' 

 showed some signs of curling. 



American AVonder and Advancr peas were grown, ami in every <asf tiny weir 

 l.irger and more fruitful in the dark house. The electric light did not inmase th«- 

 .size of leaves, as it did in the radishes. The results are similar to those obfaint-d in 

 1H90. 



Thelettuce. however, was greatly benefited by the electric light. We had found i li;i i 

 under the protected light the lettuce had made a better growth than in normal con- 

 <litions, but now it showed still greater difference. Lettuce of two varieties— Lan- 

 dretli Forcing and Tennis Ball or Boston Market— was grown. • * » Three 

 weeks after triinsplanting (February .^) both varieties in the light bouse were fnlly 

 .".() per cent in advance of those in the dark house in size, and the color and other 

 characters of the plants were fully as good. The plants had received at tliis time 

 70^ hours of electric light. .Tust a month later the first heads were sold from the 

 light house, but it was 6 weeks later when the first heads were sold from the dark 

 house. In other words, the electric-light plants were 2 weeks ahead of the other- 

 This gain had been purchased by K)!] hours of eh-ctric light, worth at cnrreiii 

 prices of street lighting about $1. 



This lettuce test was re])eated ami was watched very closely when the laniji \>.i- 

 transferred to the com])artment which hiul formerly been kept under normal comb 

 tions. The same results were obtained, and th«' differences in the two crops wen- so 

 marked as to arrest the attention of every visitor. The electric liyht plants were in 

 every way as good in qu.vlity as those grown in flie dark house; in fact the t\\.. 

 could not be told apart exce]>t for their different sizes. 



[In .inolher experiment where r.ainhelh Forcing ieltnce was grown] the electrit- 

 iight plants were upon the benches 44 tlays hetoru tlic lilst heads were sold. Purlin; 



