ELECTRICAL EXPERIMENTS 397 



power sufficient to light three mercury- vapour lamps, 

 the cost of running which is 2jd. per hour for petrol. 

 Coal at lod. per cwt. works out at 2d. per day ; three 

 lamps, running four hours, gd., total nd., against is. id. 

 for coal to keep up stove heat. A practical electrical 

 engineer worked out for me that getting supply from a 

 main would cost less than id. per lamp per hour, the 

 consumption per lamp being about one-fifth of a kilowatt 

 per hour.'* 



Miss Dudgeon's experiments are of much interest and 

 importance, and should receive the attention of market- 

 growers. 



I may add that Mr. J. E. Newman has had marked 

 success with Tomatoes and Cucumbers in greenhouses 

 with the high-tension discharge as well as out of doors. 



In view of the encouraging results which have attended 

 the foregoing experiments it would seem that electricity 

 is likely to prove a valuable factor in horticulture in the 

 future. 



