ON THE CIRCULATION OF UNDERGROUND WATERS. 



229 



Magnesium sulphate . 

 Sodium silicate . 

 Aluminium and iron phosphates 

 Water with calcium suljihate 



Total solids 



Total solids .... 

 Total solids by evaporation 



Grains per Gallon 

 2.^-729.5 



1-9485 



2-8300 

 10-3209 



Difference 

 microscopic examination of the sediment 



141-9218 



141-9218 

 141-8500 



grit 



0-07] 8 



The microscopic examination of the sediment shows mineral 

 and sand, some crystalline particles, probably carbonate of lime, a little 

 mycelium of fungi, but no trace of animal or vegetable life. 



This water is quite unfit for a water-supply on account of the large 

 quantity of lime, magnesia, and sulphuric acid. Perhaps if the borings 

 were continued farther a softer water might be obtained. 



Attention is called to the case of the Clifton Asylum Well, where the 

 solids are now only about 20 grains, whereas I believe that previous to 

 deepening the water was too hard to use. 



F. De Chaumont, M.D., F.R.S., 

 Laboratory, Army Medical School, Professor of Military Hygiene, 



Eoj-al Victoria Hospital, Netley, Army Medical School. 



January 24, 1880. 



Grains per Gallon 

 Volatile matter (by incineration and after re-carbonating) . 17500 



Parts per 1,000,000 

 Oxygen required for oxidisable organic matter . 0-5800 



Ammonia, free 0-4548 



Ammonia, albuminoid ...... 0-0960 



Nitric acid (NO3) 8-5529 



Nitrous acid (NO2) 0-2300 



N.B. — These constituents, with the oxidisable 

 organic matter indicated by the oxygen required 

 are included in the Volatile Matter. 



Total nitrogen included in nitrates and nitrites 1-5497 



