To prepare the following approximately correct solutions, dissolve the amount of medicament indicated in sufficient water to make one imperial pint.

For 1/50 per cent, or 1 in 5,000 solution, use 1.75 grains of the medicament.

For 1/20 per cent, or 1 in 2,000 solution, use 4⅜ grains of the medicament.

For 1/10 per cent, or 1 in 1,000 solution, use 8| grains of the medicament.

For 0.25 per cent, or 1 in 400 solution, use 21⅞ grains of the medicament.

For 0.5 per cent, or 1 in 200 solution, use 43.75 grains of the medicament.

For 1 per cent, or 1 in 100 solution, use 87.5 grains of the medicament.

For 2 per cent, or 1 in 50 solution, use 175 grains of the medicament.

For 4 per cent, or 1 in 25 solution, use 350 grains of the medicament.

For 5 per cent, or 1 in 20 solution, use 437.5 grains of the medicament.

For 10 per cent, or 1 in 10 solution, use 875 grains of the medicament.

To make smaller quantities of any solution, use less water and reduce the medicament in proportion to the amount of water employed; thus 0.5 imperial pint of a 1 per cent solution will require 43.75 grains of the medicament.