226
THE ESSEX NATURALIST.
from "The Mineral Waters and Medicinal Springs of Essex,"
by Miller Christy and May Thresh.
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 it 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.
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 +200 C.