Test for Magnesia in Water.--Boil the water to a twentieth part of
its weight, and then drop a few grains of neutral carbonate of ammonia
into a glass of it, and a few drops of phosphate of soda. If magnesia
be present, it will fall to the bottom.
Test for Iron in Water.--1. Boil a little nutgall and add to the
water. If it turns gray or slate, black iron is present. 2. Dissolve
a little prussiate of potash, and, if iron is present, it will turn
blue.
Test for Lime in Water.--Into a glass of water put two drops of oxalic
acid and blow upon it. If it gets milky, lime is present.
Test for Acid in Water.--Take a piece of litmus paper. If it turns
red, there must be acid. If it precipitates on adding lime water, it
is carbonic acid. If a blue sugar paper is turned red, it is a mineral
acid.
Value of Manufactured Steel.--A pound of very fine steel wire to make
watch springs of, is worth about $4; this will make 17,000 springs,
worth $7,000.
Horses in Norway have a very sensible way of taking their food, which
perhaps might be beneficially followed here. They have a bucket of
water put down beside their allowance of hay. It is interesting to
see with what relish they take a sip of the one and a mouthful of
the other alternately, sometimes only moistening their mouths, as
a rational being would do while eating a dinner of such dry food. A
broken-winded horse is scarcely ever seen in Norway, and the
question is if the mode of feeding has not something to do with the
preservation of the animal's respiratory organs.
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