This section is from the book "Commercial Gardening Vol1", by John Weathers (the Editor). Also available from Amazon: Commercial Gardening, A Practical & Scientific Treatise For Market Gardeners.
This is made by boiling the ashes of plants with water and evaporating to dryness. It is deliquescent and very soluble in water. The strength varies from 40 to 85 per cent. It is used as an insecticide and fungicide, 1 lb. being sufficient for 10 gal. of water.