Acid, Boric. 5 dr. in a pint of water makes a 4% solution, or 1:25.

Acid, Carbolic. 15 ?? in a quart of water makes a 0.1% solution, or 1:1000. 5 dr. to the quart makes a 2% solution; and 1¼ oz. to the quart, a 5% solution.

Chinosol. 15 gr. to the quart of water makes a solution of 1:1000.

Formalin. 1 dr. to the quart of water makes a solution of about 1:500.

Mercury Bichloride. 15 gr. to the quart of water makes a 0.1% solution, or 1:1000. 1½ gr. to the quart makes a 0.01% solution, or 1:10,000.

Normal Salt Solution. 2 dr. of salt to the quart of water, or 0.9%.

Physiological Salt Solution. Take normal salt solution as given above and to every 3½ oz. add 15 gr. of carbonate of soda.

Potassium Permanganate. 2½ dr. to the quart makes a 1% solution. 3 gr. to the quart makes a 1:5000 solution.

Silver Nitrate. 4½ gr. to the ounce of water or 1 gr. to 1–7/10 dr. makes a 1% solution.

Ziratol. 2½ teaspoonfuls to a quart of water makes a 1% solution.

For general reference the following valuable table is appended:

The table shows the quantity of drug required to yield a given volume of solution of the percentage strength desired. Thus, to make one fluid ounce of a 5 per cent solution it is merely necessary to dissolve 23.4 grains of the salt in sufficient water to make one fluid ounce.