The serum-only method is usually preferred in actual outbreaks and for hogs not yet sick, because this gives immediate protection, and the hogs, being naturally exposed, usually develop a permanent immunity. The simultaneous method of vaccination is preferred where we are very confident of the serum’s potency against the virulent blood, and for hogs that have not yet been infected. It may yet be found wise to use this method even in outbreaks. =Vaccination Does Not Spread Cholera.=--Every intelligent stockman who reads this will probably ask if there is not danger of scattering cholera by this simultaneous vaccination into districts where it has not yet appeared. A considerable amount of direct evidence on this point is better than any amount of theorizing and personal opinions. This evidence all agrees that unless the vaccinated hogs become distinctly sick as a result of the vaccination (which can occur, and does very often), that there is practically no danger of disseminating the disease. This is especially true since all hogs on the farm are supposed to have been treated and are immune, and, therefore, incapable of developing cholera and so spreading the disease. It does occur, even with good serum, perhaps, that an occasional hog may become a little sick, and very rarely even die, as a result of vaccination. But with good serum given in standard dose and virulent blood also given in proper dose, the risk of this is so small that it may be safely disregarded and especially when all hogs on the farm or that may be exposed with such sick hogs have been treated. =HOLLOW HORN.=--A common term to denote a diseased condition of the blood. The horn is not hollow and never is. The old quack method of boring a hole in the horn with a gimlet and squirting turpentine into the orifice is both cruel and ridiculous. While in fact the temperature of the horn is low, it is because of the general poverty of the blood of the animal. There is no merit in this kind of treatment. The most common symptoms are general debility, scanty flesh, scurvy coat and coarse hair. The appetite is also irregular and at times greedy. Treatment is in line of better food and general improvement of the system. If lice are found on the body, they must be destroyed by disinfectants and washes. A tonic, consisting of 2 teaspoonfuls of sulphate of iron, 1 teaspoonful of powdered nux vomica and 4 tablespoonfuls of ground gentian root given each day in the food or as a drench, will be very helpful in toning up the system and in enriching the blood. The most important factor of the treatment, however, is in nutritious, wholesome food. =HOOF CRACKS.=--See Sand Cracks.