Phosphorus is "a non-metallic element obtained from bones", and by itself is seldom administered to equine patients. It effects changes in certain tissues, especially bone, and in small and long-continued doses increases their density. It is a very active poison in any but fractional doses, and speedily induces fatty heart, liver, and other organs. It is given in obscure cases of paralysis and debility in combination with mineral tonics. Phosphoric acid is prescribed with vegetable bitters, and the salts are prescribed for colts with soft bones (rickets). Phosphates of lime, iron, soda, and magnesia are given as a syrup to assist bone formation in young animals.