Henley's Twentieth Century Formulas, Recipes and Processes

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Sixteen fluidounces are equal to 1 pint.

Two pints are equal to 1 quart.

Four quarts are equal to 1 gallon.

One pint of distilled water weighs about 1 pound.

Percentage Solutions.

For ¹/₅₀ per cent, or 1 in 5,000 solution, use 1 ³/₄ grains of the med­i­ca­ment.

For ¹/₂₀ per cent, or 1 in 2,000 solution, use 4 ³/₈ grains of the med­i­ca­ment.

For ¹/₁₀ per cent, or 1 in 1,000 solution, use 8 ³/₄ grains of the med­i­ca­ment.

For ¹/₄ per cent, or 1 in 400 solution, use 21 ⁷/₈ grains of the med­i­ca­ment.

For ¹/₂ per cent, or 1 in 200 solution, use 43 ³/₄ grains of the med­i­ca­ment.