Second Report Upon Electbo-Horticultuee. 



205 



It will be seen from the ayerages in the first part of the table 

 that the plants in the lighthouse were ahead in every feature. 

 It will also be noticed that the proportion of tops (column 2) to 

 the entire plant (column 1) is greater in the light than in che 

 dark house, the difference being that between fifty-five per cent 

 and forty-nine per cent. All these results are interesting when 

 compared with our former experience, for they show how much 

 the simple interposition of plain glass may modify the influence 

 of the light. In 1890, under the naked light, radishes were uni- 

 formly injured, the loss ranging from forty-five to sixty-five per 

 cent; the same year under a light protected by an opal globe, the 

 injury was still apparent, but the loss in tubers was only from 

 one to five per cent of the crop, but at the same time the weight 

 of leaves was increased; now, this year, under light strained 

 through a globe and a glass roof, there was an increase in both 

 tubers and tops. 



It may now be asked at what distance from the lamp the best 

 results were obtained, for our radishes this year were grown on 

 three parallel benches covering a distance of twenty feet. Unfor- 

 tunately, I can not answer this question, for different varieties 

 were grown on the different benches and the benches are, there- 

 fore, not comparable. The averages for the different benches 

 are given in the second part of the table, however, but the 

 figures are so contradictory that little can be learned from them. 

 Asa rule, the best results, as shown by the figures, were obtained 

 on the bench farthest from the light, but this may be due to 

 variety. More reliable figures can be obtained from different 

 parts of a bed under the light, one sash being chosen from directly 

 under the light, and one from thirteen to fifteen feet away and 

 where only diffused light reached the plants. These figures are 

 as follows, all pertaining to the same variety, the Scarlet Globe: 



