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The stools are dark green, containing calomel, mercuric sulphide and bile which, owing to the antiseptic action, has not been decomposed.

Metacinnabarite is a cubic form of mercuric sulphide, this compound being dimorphous.

Mercuric sulphide forms the brilliant red pigment, vermilion, and mercuric oxide is becoming increasingly important in anti-fouling marine paint for ship-bottoms.

The residue, filtered, washed, and boiled with dilute nitric acid, will, in the absence of much lead, be pure mercuric sulphide.

After a thorough and final washing with hot water, the tender skin is carefully dried and gently smeared with a sulphur ointment containing one to two drams of sulphur to the ounce of vaselin, often with the addition of from one-quarter to one-half grain of mercuric sulphide.