REPORT OF THE CHEMIST 



195 



SESSIONAL PAPER No. 16 



precautions are unnecessary. The bacteria whicli are engaged in this destruction, 

 or ratlier nitrilication, of the organic matter of the sewage do not all belong to that 

 class which can only thrive in the absence of the oxygen of the air. Ilowever, these 

 considerations need not be here further discussed. It is sufficient for our present 

 purpose to know that tlie system, as consisting of the closed tank and distributing 

 tiles, is efficient alike in the satisfactory disposal of house sewage and waste from the 

 i.r.r.co fnctnry or creamery. 



For practical purposes — that is, for the installation of the system — the following 

 details and the accompanying illustrations will no doubt prove serviceable. 





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