10 
milky in appearance, sufficient CO, for all practical purposes 
has been introduced. 
8. If the inlet and outlet pipes be fitted with stopcocks, 
the CO, gas can be drawn off at any time to permit of entrance 
to the barn. If both stopcocks be opened the CO, gas will 
drain away through the lower tap. t 
9. Asbestos-covering to stacks built on stone or concrete 
floors is suggested, because it is fire-proof, rat and mice- 
to stacks have served their purpose, the material could be sold 
or used for building purposes. Less durable materials are 
more costly in the long run. : 1 
10. Cracks and joints can be made gas-tight with a sus 
mixture of finely-ground pipeclay and raw lins 1l. 
11. Asbestos sheets can be made in the State from local 
deposits of the mineral. 
