Bichromate of potash is used extensively in dyeing, calico printing, in the manufacture of porcelain, in chemistry and photography, and to a slight extent in medicine, while lead chromate (chrome yellow) is a valuable pigment. Chromic acid is one of the most potent caustics, at a moderately high temperature dissolving all animal products that may be subjected to it. The chromate and bichromate of potash are only less violently caustic, producing deep and fistulous sores on the hands of the dyers, and acting in a similar manner on the mucosa of the alimentary canal. Twenty-eight grains of the bichromate given by the stomach killed a rabbit in two hours, while 45 grains of the chromate had no such effect (Gmelin). Pelikan found that the bichromate acted like arsenic or mercuric chloride, producing violent irritation of the stomach and intestines, followed by albuminuria, hæmaturia and emaciation: 1 to 5½ grains proved fatal to rabbits and dogs. Workmen inhaling the bichromate dust, have inflammation, ulceration and finally destruction of the nasal septum, together with skin eruptions and ulcerations. Horses working at the factories have intractable ulcers of the skin and sometimes shed the hoofs (B. W. Richardson). _Symptoms._ Taken by the mouth the bichromate causes colicy pains, emesis in vomiting animals, diarrhœa, great prostration, cold extremities, vertigo, stiffness or weakness of the hind limbs, dilated pupils, weak pulse and death. If protracted the urine may be bloody and albuminous. _Lesions._ There is more or less intense congestion of the stomach and intestine, yellow shrunken mucosa, abrasions, sloughs, and ulcers, and congested kidneys with yellow cloudiness of the epithelium of the convoluted tubes and congestion of the glomeruli. _Treatment._ Wash out the stomach by emesis or the stomach pump and use albuminous and mucilaginous agents freely. POISONING BY CARBOLIC ACID. Susceptibility of cat and other animals. Fatal dose. Effect of dilution and gastric plenitude. Concentrated is corrosive. Symptoms: Salivation, dysphagia, anorexia, thirst, emesis, colic, arched back, odor of the acid, dark, greenish brown, albuminous urine, tremors, lowered temperature, debility, stertor, stupor, coma. Lesions: Whitened corroded mucosa, inflammation, ecchymosis, dark, liquid blood, brain effusions or extravasations, nephritic congestion. Treatment: Vinegar, alcohol, emesis, demulcents, Glauber salts. The cat is the most susceptible to this poison. For dogs, cats and rabbits from 3 to 4 drops per pound, is the minimum fatal dose. For an ordinary dog the lethal dose is ½ to 1 drachm. The horse has taken 3 ounces without fatal results, and 15 ounces in a week (Munk). Much depends on the dilution of the agent and the plenitude of the stomach. In a concentrated state it acts at once on the mucosa as a caustic abstracting the water and forming a white eschar.