30 WATER-LILIES 



gether at the top and properly braced by strips 

 (E) to prevent their springing under pressure, 

 after which the space between them was 

 filled with concrete, thoroughly packed. As 

 soon as the material had sufficiently set, the 

 inner box or core (C), and the top board of 

 the outer box or casing, were removed, leaving 

 the side-walls. The space outside the walls 

 was then filled in and the coping frame was 

 placed in position level with the tops of the 

 walls. 



" A lining of sand and cement was applied 

 to the inner faces of the bottom and side- 

 walls, and the coping of the same material 

 was formed upon the latter, the frame 

 (E) constituting a guide in making the 

 same. 



" The cost of the tank was as follows. 



Labour on construction, 3 days at i?i.25 $ 3.75 



Labour for breaking stone 2.00 



Portland cement, 2^ bbls. at ^1.85 4.63 



Pipes go 



$11.28 



"In explanation it may be stated that the 



