152 



Nature-Study Agriculture 



pond at little cost. The simplest way to make a pond is 

 to sink several tubs side by side in the ground. Lily 

 bulbs are planted in boxes of rich earth set at the bot- 

 toms of the tubs. The tubs are rilled half or two thirds 

 full of good soil that has been mixed with well-rotted 

 manure, and are then filled to the top with water. 

 At a little more expense a small cement pond can easily 

 be made (Fig. 124). 



When the pool has once been filled, the water does 



not need to be renewed, but enough water must be 



Preventing added to make up for evaporation. We may keep 



green shme the pool ^ Qm k ecomm g fined with algae (green slime) 



by putting a- little bluestone in the water. The 

 bluestone will not hurt the lilies, but as little of it 



Lee Passmore 



FIG. 124. These lily pools are lined with cement. Though few of us could 

 have so large a water garden, most of us could have gardens that would be 

 beautiful. 



