Q24 REPORT—1840. 
bined, one volume in thirty-six, on the average, of a mixed gas, 
consisting of 
Atmospheric air, 
Carburetted hydrogen, 
Hydro-sulphuric acid, 
Carbonic acid, 
the proportions of which vary at different times. The residue 
of the water very gently evaporated yields at times traces of 
phosphate of ammonia. Its boiling point is in glass = 213°°5 
Fahr., barom. 30°2 inches. Its specific gravity is = 1:02770 
at maximum found. 
148. The water from No. 3, or clear sea water, at 115° 
Fahr., is of course, in all respects, the same as the water from 
Kingstown Harbour, except containing less combined air. 
149. The water of No. 4, or that from the river Liffey, 
within the tidal limits, consists of a variable mixture of water, 
having the same constitution as that of Kingstown Harbour, 
with the water next to follow, or No. 5. It is alternately fresh 
and salt with the rise and fall of tide, and always foul; much 
organic matter is suspended in it, and some extremely divided 
silex. It evolves hydrosulphuric acid and common air on 
boiling, and contains about one volume of these in twenty of 
water. One cubic foot of it contains, after filtration, 581°5 
grains of solid matter, which consisted of 
Putrified organic matter . . . . . . . 28°00 
Chloride sodium ee eh ot. ohn 5 Meer nee 
Chloride and bromide of magnesium . . . 6°10 
Sulphate [IME . <5 es ss ys ee ee 
Sulphate magnesia . . . . - + + « + 3°00 
Loss ee ah er eee ernrre mre” tsk 28S 
100°00 
Traces of ammoniacal salts also are found, and of phosphoric 
acid or phosphates. Its specific gravity is = 1:00227, and its 
boiling point is in glass 212° Fahr., barom. = 30°1 inches. 
150. The last water, No. 5, or that of the clear stream of 
the Liffey, above the tidal limits, and above the city of Dublin, — 
contains one volume in eleven of mixed gases, which are at- 
mospheric air and carbonic acid, generally in about the pro- — 
portion— 
ANE his. vaurtem fie taco uel PA scubie amelie 
Carkionic sacl. eo Sled ice Ve 1g 8 - 
100 4 
