GASES—­CARBONIC ACID, CHLORINE, CYANOGEN, HYDROSULPHURIC ACID, ETC.—­Symptoms:  Great drowsiness, difficult respiration, features swollen, face blue as in strangulation.—­Treatment:  Artificial respirations, cold douche, frictions with stimulating substances to the surface of the body.  Inhalation of steam containing preparations of ammonia.  Cupping from nape of neck.  Internal use of chloroform.

GREEN VITRIOL.—­See Iron.

HELLEBORE, OR INDIAN POKE.—­Symptoms:  Violent vomiting and purging, bloody stools, great anxiety, tremors, vertigo, fainting, sinking of the pulse, cold sweets and convulsions.—­Treatment:  Excite speedy vomiting by large draughts of warm water, molasses and water, tickling the throat with the finger or a feather, and emetics; give oily and mucilaginous drinks, oily purgatives, and clysters, acids, strong coffee, camphor and opium.

HEMLOCK (CONIUM).—­Symptoms:  Dryness of the throat, tremors, dizziness, difficulty of swallowing, prostration and faintness, limbs powerless or paralyzed, pupils dilated, pulse rapid and feeble; insensibility and convulsions sometimes precede death.—­Treatment:  Empty the stomach and give brandy in tablespoonful doses, with half teaspoonful of spirits of Ammonia, frequently repeated, and if much pain and vomiting, give bromide of ammonium in five-grain doses every half hour.  Artificial respiration may be required.

HENBANE OR HYOSCYAMUS.—­Symptoms:  Muscular twitching, inability to articulate plainly, dimness of vision and stupor; later, vomiting and purging, small, intermittent pulse, convulsive movement of the extremities and coma.  Treatment:  Similar to Opium Poisoning, which see.

IODINE.—­Symptoms:  Burning pain in throat, lacerating pain in the stomach, fruitless effort to vomit, excessive tenderness of the epigastrium.  Treatment:  Free emesis, prompt administration of starch, wheat flour, or arrowroot, beat up in water.

LEAD.—­ACETATE OF LEAD, SUGAR OF LEAD, DRY WHITE LEAD, RED LEAD, LITHARGE, OR PICKLES, WINE, OR VINEGAR, SWEETENED BY LEAD.—­Symptoms:  When taken in large doses, a sweet but astringent metallic taste exists, with constriction in the throat, pain in the region of the stomach, painful, obstinate, and frequently bloody vomitings, hiccough, convulsions or spasms, and death.  When taken in small but long-continued doses, it produces colic, called painter’s colic; great pain, obstinate constipation, and in extreme cases paralytic, symptoms, especially wrist-drop, with a blue line along the edge of the gums.  Treatment:  To counteract the poison, give alum in water, one and a half ounce to a quart; or, better still, Epsom salts or Glauber salts, an ounce of either in a quart of water; or dilute sulphuric acid, a teaspoonful in a quart of water.  If a large quantity of sugar of lead has been recently taken, empty the stomach by an emetic of sulphate of zinc (one drachm in a quart of water), giving one-fourth to commence, and repeating smaller doses until free vomiting is produced; castor oil should be given to clear the bowels, and injections of oil and starch freely administered.  If the body is cold, use the warm bath.