A method in practice among the best butter makers in England for rendering butter firm and solid during the hot weather is as follows: Carbonate of soda and alum made into powder are used for the purpose. For twenty pounds of butter, one teaspoonful of carbonate of soda, and one of powdered alum, mixed together at the time of churning, and put into the cream. The effect of this powder is to make the butter come firm and solid, and give it a clean, sweet flavor. It does not enter into the butter, but its action is upon the cream, and it passes off with the buttermilk. The ingredients of the powder should not be mixed together until required to be used, or at the time the cream is in the churn ready for churning.