Probably one of the commonest and most distressing of complaints in the cat is _diarrhoea_; and what makes it all the more distressing, is the fact that, instead of receiving sympathy and good treatment in her distress, she is often harshly treated, kicked about, and thrust out of doors. Diarrhoea is usually brought about by want of regular feeding, by improper food, and exposure to wet and cold. Different sorts of food will also induce it--such as rancid horseflesh, sour milk, an over-allowance of fat or liver. If taken at once, the treatment is generally very successful; if let go on too long, the cat will rapidly lose flesh; and the advent of dysentery will make it a charity to put her out of the way. Give her at first a small teaspoonful of castor-oil, to which add two drops of solution of muriate of morphia. This will often stop it, and remove all offending matter from the intestines. If there is no improvement, repeat the dose on the second morning, and give small doses of common chalk mixture three times a day, with two drops of laudanum divided between the three doses. Let her have nothing but bread and milk to eat, or a little corn-flour, if she will take it; if not, give her fish--she won't refuse that. A few drops of solution of lime added to her milk will do good. If she be very much reduced in weight, and has no appetite, try two grains of quinine made into twelve pills with breadcrumb: dose, one three times a day. Or you may give cod-liver oil. _Dysentery_ is a frequent sequel to badly-treated diarrhoea. It is simply ulceration of the coats of the bowels, combined with great emaciation, roughness of coat, dejected look, and loss of appetite. Unless a very valuable cat, I would not advise you to keep her alive. You may, however, with patience, bring her round. Give her, then, a grain or two of calomel occasionally, and quinine three times a day, unless she exhibits any tendency to fits. House her well, and give her the most generous of diet--raw meat, eggs, etc, and a little port wine daily, or even a small quantity of brandy. _Gastritis_, or inflammation of the stomach, is by no means rare in the cat, and is frequently the result of poison having been given with the hope of causing death. The cat simply pines, and gets thin, and refuses nearly all food, which, when she does eat, causes pain, sickness, and vomiting. The bowels, too, are often disordered. There is nothing better, in these cases, than the tris-nitrate of bismuth, from one to three grains to be placed on the tongue twice or thrice daily. You may also give occasionally a grain or two of calomel with a little rhubarb powder. If there is much emaciation, cod-liver oil may be tried, and a small allowance of raw meat, cut into little bits; and quinine.