65 
A calcTilation of these results on the usual assumptions of 
the combination of the different bases and acids, yields the 
following result for sample (a), leaving the small amounts of 
Silica and Ammonia out of consideration. 
Silica 
Calcium Sulphate 
Magnesium Sulphate . . . 
Magnesium Chloride... 
Sodium Chloride 
Potassium Chloride . . . 
0*42 Grms. per Gal. 
103-21 
14-68 
37-07 
270-03 
84-90 
j? 
510-31 
The lime is placed as in combination with Sulphuric Acid, 
as forming the most insoluble compound with it, and that a 
considerable amount of the Magnesium is combined with 
Chlorine is evident from the fact, that an estimation of 
Chlorine in the solid residue, after heating it for some time 
to 170° C. gave only 219 ’8 grains of Cl. per gallon, showing 
a loss of 11-9 grains. The relative amounts of Potassium 
and Sodium Chlorides are calculated by difference, from the 
total Alkali and Chlorine. 
Remarks on results of Analysis. — The proportion between 
the free and Alluminoid Ammonia, in this water is very 
remarkable, the amount of the former being conspicuously 
large (0-94 pts. per mil), whereas the latter is hardly more 
than detectable (0-06). The amounts of Alkaline Chlorides 
(354-93 grms. per gal.) is very large, mostly consisting as 
will be seen of Chloride of Sodium. We are of opinion that 
this is due to the upward absorption of a certain amount of 
sea water by the porous rocks through which the waters of 
the spring find their way, in fact the whole contents of the 
water seem to be only such as might be naturally expected 
from the nature of the rock construction of the Humphrey 
Head and its proximity to the sea. It is stated in works 
referring to this district that this spring was at one time in 
