506 



Messrs. Carnelley and Haldane. 



Total No. of 

 micro-organ- 

 isms per litre 

 of air. 



13 (3) 

 14 -5 (0 -5) 

 4 (0) 

 25 (1) 

 16 (1 -2) 



6(0) 

 [103 (0)]t 

 12 (2) 

 12 (2) 

 60(-) 



Vols, of 

 oxygen re- 

 quired to 

 oxidise the or- 

 ganic matter 

 in 1,000,000 

 vols, of air. 



18-2 

 7-6 

 6-7 

 6*4 



2 2 



31 

 9-6 

 3-8 

 9-1 



3 1 



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Temp. F. 



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Approximate 

 height of 

 sewer. 



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Time. 



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