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APPENDIX. 121
When heated, this water became turbid; and, by continued boiling
for two hours in an apparatus so arranged that the whole of
the steam was condensed and returned to the water, 10.95 grs.
of the earthy carbonates, coloured by oxide of iron, were deposited.
The relative hardness of this water, as determined by the Soap
test, distilled water being taken as unity, was 13.3.
B. The second sample of water was taken from a small tap in
the house of Mr. Hall, Bishopsgate street. The tap was attached
to the main.
This water was without smell or taste, and free from floating
matter. After standing some time, it deposited a very small
quantity of oxide of iron. Although clear and transparent, it
was not bright.

Like the preceding water it became turbid when heated to the
boiling point, and by continued ebullition for two hours, 12.90 grs.
of carbonate of lime, coloured by oxide of iron, were precipitated.
Hardness in reference to distilled water as unity = 19.
C. This water was taken by ourselves from a spring-head
near Haslemere, Surrey. The spring issued from the foot of a
low sand-hill covered with bushes, and was received into a natural
basin, about four or five feet in diameter, the bottom of which
was lined with pebbles and small gravel. From this basin the
water flowed into a large shallow pond.
The temperature of the spring at its source was 49° Fahr., that
of the air being 56° Fahr.
This water was perfectly clear and brilliant, but not sparkling.
It had no appreciable taste, but was peculiarly soft and agreeable.
K