Contractions. - Ammon. Caust. A.-cs. Synonym. - Liquor Ammoniae Fortior. Present name. - Amnionic Hydrate. Nh4ho.

The strong solution of Ammoniacal Gas (Nh3) in water is directed by the British Pharmacopoeia to be prepared as follows: -

Take of

Chloride of Ammonium, in coarse powder . . . . .

3 pounds;

Slaked Lime ....

4 pounds;

Distilled Water . . . . 1

32 fl. ounces.

Mix the Lime with the Chloride of Ammonium, and introduce the mixture into an iron bottle placed in a metal pot surrounded by sand. Connect the iron tube, which screws air-tight into the bottle in the usual manner, by corks, glass tubes, and caoutchouc collars, with a Woulf's bottle capable of holding a pint; connect this with a second Woulf's bottle of the same size, the second bottle with a matrass of the capacity of 3 pints, in which 22 ounces of the distilled water are placed, and the matrass, by means of a tube bent twice at right angles, with an ordinary bottle containing the remaining 10 ounces of distilled water. Bottles 1 and 2 are empty, and the latter and the matrass which contains the 22 ounces of distilled water are furnished each with a siphon safety tube charged with a very short column of Mercury. The heat of a fire, which should be very gradually raised, is now to be applied to the metal pot, and continued until bubbles of condensible gas cease to escape from the extremity of the glass tube which dips into the water of the matrass. The process being terminated, the matrass will contain about 43 fluid ounces of strong Solution of Ammonia.

Bottles 1 and 2 will now include, the first about 16, the second about 10 fluid ounces of a coloured ammo-niacal liquid. Place this in a flask closed by a cork, which should be perforated by a siphon safety tube containing a little Mercury, and also by a second tube bent twice at right angles, and made to pass to the bottom of the terminal bottle used in the preceding process. Apply heat to the flask until the coloured liquid it contains is reduced to three-fourths of its original bulk. The product now contained in the terminal bottle will be nearly of the strength of Solution of Ammonia, and may be made exactly so by the addition of the proper quantity of distilled water or of strong solution of Ammonia.

Characters and Tests. - A colourless liquid, with a characteristic and very pungent odour, and strong alkaline reaction. Sp. gr. 0.891. 52.3 grains by weight require for neutralization 1,000 grain measures of the volumetric solution of Oxalic Acid. 1 fluid drachm contains 15.83 grains of Ammonia, Nh3. When diluted with four times its volume of distilled water, it does not give precipitates with solution of Lime, Oxalate of Ammonia, Sulphide of Ammonium, or Ammonio-Sulphate of Copper; and, when treated with an excess of Nitric Acid, is not rendered turbid by Nitrate of Silver or by Chloride of Barium.

Preparation. - 3 fluid ounces mixed with 5 fluid ounces of distilled water, will form the lx dilution. Water should be used for making 1, then dilute alcohol up to 2, and afterwards rectified spirit.

Reference to Horn. Proving. - Marcy and Peters' New Mat. Med.

Proper forms for dispensing. - lx to 2, Solution only. 5X and upwards, Tincture, Pilules, or Globules.

N.B. - This preparation is liable to lose strength by keeping; hence the lx attenuation should be prepared immediately after it has been found to correspond to the specific gravity required.