THE EARTH'S BOUNTY 



the ground, the surface soil inside the circle, 

 and for two feet all round the outside, was re- 

 moved to a depth of ten inches, to permit a 

 layer of coarse stone to be laid as sub-founda- 

 tion for the mixture of Portland cement and 

 gravel, a two-inch layer of which formed the 

 foundation for the finishing application of 

 Portland cement and fine gravel, that gives 

 the smooth, stone-like surface to concrete 

 work. 



The permanent posts for the cylinder were 

 6X6 material (a a a a, Fig. 1), 30 feet long, 

 and were erected at equal distances,, held se- 

 curely in place by a scaffolding, which was 

 erected as shown in the sketch of ground plan, 

 which I am allowed to reproduce by courtesy 

 of the Agricultural Department. The posts 

 (b b b b, Fig. 1) are of 2 X 4 scantling. The 

 boards nailed from the corner posts, and to 

 the 6 X 6 material, form a rigid framework, 

 across which the planks (c c c c, Fig. 1) for 

 the scaffold platform are laid. 



Before going further, the staves were 

 84 



