10 



milky in appearance, sufficient C0 2 for all practical purposes 

 has been introduced. 



8. If the inlet and outlet pipes be fitted with stopcocks, 

 the C0 2 gas can be drawn off at any time to permit of entrance 

 to the barn. If both stopcocks be opened the C0 2 gas will 

 drain away through the lower tap. 



9. Asbestos-covering to stacks built on stone or concrete 

 floors is suggested, because it is fire-proof, rat and mice- 

 proof, and will withstand heavy knocks which would make 

 holes through softer material. When the asbestos-coverings 

 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. 



10. Cracks and joints can be made gas-tight with a stiff 

 mixture of finely-ground pipeclay and raw linseed oil. 



11. Asbestos sheets can be made in the State from local 

 deposits of the mineral. 



