112 How TO Gbow Cut Flowers. 



when it will be found to be best to add a power boiler 

 for this and other purposes. 



The illustration ( Fig. 28) shows all pipes necessary 

 saving those leading into the house through which the 

 vapor is discharged. These maj' be of three-fourths inch 

 gas pipe, and after connecting with the main and plac- 

 ing a cut off valve at some convenient point, drop to 

 where they are to be carried into the house. The point 

 where it enters should be under and near the south side 

 of a middle bench. 



If the house is 100 feet in length, have three openings 

 in the pipe for the liberation of the vapor; the first one 

 twenty feet from where the pipe enters the house, the 

 second in the centre, and the third within twenty feet 

 of the extreme end, and Avhen in use this last may 



Pig. 29. 



be left fully open. See Fig. 29. The opening in the 

 centre should be half-inch, while that nearest the main 

 feed should notbe over three-eighths. These variations 

 in the size of the discharge will materially assist in the 

 equalization of the distribution, and if so arranged as to 

 discharge in a straight line with the pipe, no harm will 

 ensue from burning or scalding either root or foliage. 

 If it is desired to use this line of pipe for any other 



