Two little histories out of a great number will sufficiently illustrate these cases. A terrier had scarcely eaten during more than a week. He dropped his meat after attempting to chew it, and the breath was very offensive. Several of the teeth were loose, and the rest were thickly encrusted with tartar. The gums had receded from the teeth, and were red, sore, and ulcerated. I removed all the loose teeth; for experience had taught me that they rarely or never became again fixed. I next, with the forceps and knife, cleaned the others, and ordered the diluted chlorinated lime to be alternated with tincture of myrrh and water. The extraction of the loose teeth, and the removal of the tartar from those that were sound, occupied a full hour; for the dog resisted with all his might. He, however, soon began to eat; the lotions were continued; and five months afterwards, the mouth of the dog was not in the slightest degree offensive. An old dog should not be quite abandoned. A pug had only four teeth remaining beside the canines. They were all thickly covered with tartar, and two of them were very loose. The gums and lips were in a dreadfully cankerous state, and the dog was unable to eat. All that he could do was to lap a little milk or broth. I extracted the two loose teeth, cleaned the others, and ordered a lotion of equal parts of tincture of myrrh and water to be applied. '13th August', 1842.--A very considerable discharge of pus was observed, with blood from the mouth, apparently proceeding from the cavity whence one of the teeth had been extracted. The dog is exceedingly thirsty, and walks round and round the water-dish, but is afraid to lap. He has not eaten for two days. Use the lotion as before, and force him with strong soup. '15th.' The dog has not voluntarily eaten, but is still forced with soup. He is very costive. Give two grains of calomel and an equal quantity of antimonial powder. '18th.' He has eaten a very little, but gets thinner and weaker. Continue the lotion. '27th.' The ulcers are nearly healed, and the discharge of pus has ceased. '31st.' The mouth is clean, the gums are healed, and there is no longer anything offensive about the dog. THE LARYNX is placed at the top of the windpipe, the exit from the lungs, and is also connected with the Schneiderian membrane. At its upper part is the epiglottis, the main guard against the passage of the food into the respiratory tubes, and, at the same time, of the instrument of the voice. It consists of five cartilages united together by a ligamentous substance, and, by distinct and perfect articulations, adapting itself to every change of the respiratory process and the production of the voice.