16 
BURRELL : THE ANALYSIS OF ILKLEY SPA WATER 
1-200 grains per gallon. 
0-501 ' 
10-796 
6-581 cubic inches per gallon. 
Silica 
Chloride of Sodium 
Solid Matter 
Free Carbonic Acid 
Temperature, 43-45° F. 
For several years past tlie writer has taken samples of the water 
from the pipe used for filling the Roman Bath at the White Wells, the 
height of which is about 660 feet above sea level. The water issues 
from the middle or third grits of the Millstone Grit series. Variations 
in temperature are very slight, the following readings selected from 
those made on ten different occasions show the extreme variations : — 
Temperature of Air (Shade). Temperature of Water. 
16-9° C. 8-8° C. 
9-4° C. 7-7° C. 
The water is clear and free from sediment. The general pro- 
cedure was that recommended by Fresenius, and all numbers given are 
the mean of at least two, and generally of three or four determinations. 
For substances present in minute quantity the residues obtained by the 
evaporation of from 45 to 50 litres of the water were used. With 
such quantities neither bromine, iodine, barium nor strontium could 
be detected. International Atomic Weights, 1912, were used for the 
calculations. 
The constituents are oiven in : — 
grams per litre. 
grains per gallon 
SiO 
0-0152 ... 
... 1-0641 
SO, 
0-0176 ... 
... 1-2368 
N.,05 
0-0001 ... 
... 0-0093 
Nitrous Acid 
none 
. . . none 
P.,0, 
trace 
. . . trace 
CI 
0-0110 ... 
... 0-7700 
Fe 
0-00016 ... 
... 0-0112 
Al 
trace 
. . . trace 
Ca 
0-0169 ... 
... M866 
Mg 
0-0090 ... 
... 0-6307 
Na 
0-0119 ... 
... 0-8331 
K 
0-00125 ... 
... 0-0876 
Li 
0-00019 ... 
... 0-0136 
Free Ammonia 
... 0-0011 
Albuminoid Ammonia 
... 0-0020 
Oxygen absorbed in 4 hours ( 
^26-6° C. ... 
... 0-0016 
