WATER ANALYSIS 



55 



free ammonia, without these necessarily indicating pollution. 

 This is especially notable in wells sunk into strata like the 

 London greensands. 



The organic nitrogen in a water is mostly determined 

 by the estimation of the albuminoid ammonia which only 

 partially measures it. If the organic nitrogen by Frank- 

 land's process be i part per 100,000, then the albuminoid 

 ammonia of the same water would be about 0-615 P ai ~t P er 

 100,000, containing 0-506 of organic nitrogen ; and the 

 organic nitrogen by the Kjeldahl process would be about 

 double that in the albuminoid ammonia, or 1-012 part 

 per 100,000. 



SPECIMEN ANALYSES (from Notter and Firth). 



NOTES. 

 Local Inspection : 



In numbers 1, 2, 5, 8, and 12, sources of pollution were absent 



or well guarded against. 

 Numbers 3 and 7 were in farmyards. 



In numbers 4, 6, 9, 10, and 11, defects in construction or in 

 protection from possible pollution were found. 



Bacteriological Examination : 



In numbers 4, 6, 7, 10, and 11, sewage organisms were found. 



Opinion : 



Numbers 1, 3, 5, 8, and 12 were returned as safe; number 2 as 

 doubtful; and numbers 4, 6, 7, 9, 10, and 11, as unsafe. 



