sample of the purified water into a small tumbler, and add a few
drops of a solution of oxalate of ammonia; this addition must neither
immediately nor after some minutes cause a milky appearance of the
water, but remain bright and clear. A white precipitate would indicate
that not enough carbonate of soda had been added. A new sample is taken
of the purified water and a solution of chloride of calcium added; a
milky appearance, especially after heating, would show that too much
carbonate of soda had been added.


RESULTS OF THIS WATER PURIFICATION.

1. The boilers do not need to be cleaned during a whole season, as they
remain entirely free from incrustation; it is only required to avoid a
collection of soluble salts in the boiler, and therefore it is partly
drawn off twice a week.

2. The iron is not touched by this purified water. The water does not
froth and does not stop up valves. The fillings in the joints of pipes,
etc., do not suffer so much, and therefore keep longer.

3. The steam is entirely free from sour gases.

4. The production of steam is easier and better.

5. A considerable saving of fuel can soon be perceived.

6. The cost of cleaning boilers from incrustation, and loss of time
caused by cleaning, is entirely done with. Old incrustations, which
could not be cleaned out before, get decomposed and break off in soft