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To Purify Glycerine (Bottles sent out)

Bottles sent out from wholesale and manufacturing houses, labeled, "Pure Glycerine," do not always contain what their labels declare.

Some samples called pure are rich in lead, others contain chlorine, most are diluted with water, and the best is generally acid. It is necessary, therefore, to purify even the best as the jelly acts upon this metal. An iron digester is the most suitable. The bones of boiled meat are nearly as productive as those of fresh meat, but roasted meat bones scarcely afford any jelly.