170 
Water-Supply 
Bolton 
Edinburgh 
Glasgow 
Chester 
Birkenhead ... 
Scarborough... 
Well at Oak Bank, Whitehaven ... 
Well near Egremont 
Wells in country, about one mile from sea 
do. do. 
do. do. 
do. do. 
Well Water above Gosforth—A ... 
Do. do. —B-.a 
Drinking Fountain at Holm Rook 
principle, that when nitrogenous organic matters (animal substances 
for instance) decompose, or become putrid, ammonia is formed 
along with other compounds, so that it is simply necessary to 
determine the amount of free ammonia in a sample of water as an 
index of the decayed organic matter, while the nitrogenous, or 
animal, matter, zo¢ decayed, may be arrived at by decomposing it 
artificially, and then by determining the amount of ammonia which 
it has produced. 
Based upon this principle of analysis, the results, as in 
Table III., have been obtained from various samples of water. 
TABLE III. 
In 100 Million parts 
of Water 
Album- 
inoid 
Ammonia.| § mmonia. 
One 7O 7 ee Ww oO Ck oe oom 64. 8 SO CO Ue SO 
o = ete Ons Dr Ww wWA HN OO NH TO 
