36 How TO Grow Cut Flowers. 



flows are taken, over your doorways. From your 

 highest upright point, let the pipes fall gradually all 

 the way round. If you use a barrel for expansion, let 

 the bottom of it be a little above the top of the flow. 

 Connect it with the return as described already, tapping 



Fie. 20. 

 the highest point on the flow pipe and carrying thence 

 an inch pipe over and into the top of the barrel. See 

 Fig. 20. 



It is also well to have one or more pet cocks at other 

 points, in order to facilitate the exit of air when filling 

 the pipes. 



