Mixing Materials.
—The mixing materials used are:
Dried Tankage.
Dried Blood.
Bone Meal.
Steam Bone.
Acid phosphates, which is phosphate rock treated with sulphuric acid—a more or less complicated process—and which product is usually purchased by small works.
Muriate of potash, a substance known as kainit usually produced from mines in Germany, although some potash is being produced from sea weed in America.
Conversion Factors.
—The following table will be found handy for changing the bone quantity into another term, as for example, wishing to know the per cent of nitrogen if ammonia be expressed: