226 THE ESSEX NATURALIST. 
from ‘“‘ The Mineral Waters and Medicinal Springs of S| 
by Miller Christy and May Thresh. 
Parts per 100,900. 
RN 
South Weald. Upminster. Hockley. 
Calctum carbonate :.. 17.0 *.. “30.073 
Calcium sulphate .: ‘59.2 ..: 80 .G)0syuNeecem 
Magnesium sulphate .: 104.7° =. 120.4. una 
Sodium sulphate w. 30.0.5. . “Eas 0.0 
Sodium chloride .. ‘10.9) s+ * \I5)2 
Silica, water of hydra- 
CLOT CCC e mae .. 19.2%. TOFOR—EE 2 
Total solids -.... 249.0 .- ~200)O,NRNES genre 
The Hockley water maintained its reputation for some time, 
but it cannot be compared with the Vange water since it contains 
no alkaline sulphates and much less magnesium sulphate. The 
true Vange water from Mr. Cash’s well is undoubtedly a strongly 
sulphated water, and 1t is much more concentrated than the other 
Essex waters now being sold as Vange water. The analysis of 
the water contained in a sealed bottle purchased by me at the 
well, and of a bottle purchased from a local chemist’s, show the 
difference between them. 
Parts per 100,000. 
Mr. Cash’s “ Vange’’ water 
well. from Hockley. - 
Calcium carbonate... 46.55) eee : 40.0 
Calctum sulphate... . 8827 | (2eaaaaae 57.4 
Magnesium sulphate .. 4095.0 .)anueeen 144.0 
Potassium sulphate-.. 38.4 “)]o0eeaeeee 0.0 
Sodium sulphate ery ee » hehe eee 0.0 
Sodium chloride ay) 00.3555 tee Dr.0 
Water of hydration, 
Silicagy cca ee . «2 0033 “eee 326.6 
Total solids 960.0 PR ccc \ 3 345.0 
The second sample is apparently Hockley water. It con- 
tains no sulphates of the alkalies and less than one-third of the 
magnesium sulphate contained in the real Vange water. It is 
obvious that as a sulphated water the Vange water is far superior 
to the other. 
* Water of hydration removed by drying at + 290°C. 
