KiLROE — The Shannon : its Course and Geological Ilistor//. 70 



Cameron for the Limerick Corporation, yielded the following results 

 as kindly supplied to the author : — 



SHANNON WATER. 



Composition of Specimen of "Water analysed for 

 Limerick Corporation. 



One Imperial gallon (70,000 grains) contains in grains marked 



Total solid matters, . . 





.. 21-000 



Including: — 







Albuminoid ammonia, 





0-012 



Saline ammonia, 





0-004 



Nitrous acid, 





none. 



Nitric acid, 





trace. 



Chlorine, . . 





1-093 



Sulphuric acid. 





.. 1-4412 



Equal to calcium sulphate, 





. . 2-0000 



Phosphoric acid, 





none. 



Colour, looked at through a 



tube 2 feet long, 



deep yellow. 



Odour, 100° F., 





none. 



Suspended particles. 





few minute. 



Turbidity, 





very slight. 



Sediment, 





very slight. 



Microscopic examination. 



Moderate numbers of micro-organisms present. 



These are fairly good waters of the peaty class. 



Charles A. Cameron. 



According to Prestwich, the waters of the Thames give of solid 

 matter 20-48 grains per gallon. Lithehy, Odling, and Abel showed that 

 unfiltered waters of the Thames above Kingston give 20-82 of solid 

 residues. Prestwich calculated his average from these figures as 20-68, 

 of which be takes 1*60 to be suspended organic matter; and by 

 deducting this latter amount from the gross solid residue, he obtained 

 19 grains as representing the inorganic or mineral matter carried off 

 by the Thames annual discharge at Kingston. The Thames water at 

 London contains 33 parts in every 100,000/ corresponding to 23-1 

 grains per gallon. The water here contains salts^ and organic matter 

 washed from the ground and atmosphere of so populous an area ; and, 

 making allowance for these, the mineral portion of the residue derived 

 from the basin would probably not greatly differ from the amount per 

 gallon obtained at Kingston. Eeturning to the figures obtained for 



1 " Text-Book of Geology," by Sir A. Geikie, d.c.l. 

 edition, p. 489. 



2 Salts of ammonia, &c. 



LL.D., F.R.S., &C., 4th 



