=Using Blackleg Vaccine.=--The blackleg vaccine now so well known is made from diseased flesh taken from a calf that has died from blackleg. This flesh, after being dried and powdered, is then properly prepared and injected into the animal. There are two kinds--a weak and a strong vaccine and single and double vaccine. The single vaccine requires but one inoculation. The latter is believed to be superior and gives better protection. The vaccine is usually available from the state experiment stations, or can be obtained through your veterinarian. About the only skill required in doing the work is in having the instruments thoroughly cleaned and disinfected. A hypodermic syringe is used and the injection made on the underside of the tail, a few inches from the tip, or just beneath the skin of the neck or shoulder. The point of the syringe should not puncture the muscle at all; simply pick up the skin and draw it away from the muscle and admit the fluid in the loose space between the two. When vaccinated, the treatment is supposed to last about a year. If calves are vaccinated the operation should be repeated at about the age of yearling. Two periods of vaccination are suggested: when turned to pasture in the spring or when turned to dry food in the fall. Full directions as to the use of vaccines always accompany the preparations and further detail is unnecessary here. Preventive medicines cannot be relied upon, although a common one is used throughout the West, made as follows: 4 ounces of sulphur, 1 ounce of saltpeter, 2 pounds of sulphate of iron, and 1 pound of air-slaked lime. After being thoroughly pulverized and mixed, this is added to one-third of a gallon of common salt and used in the place of salt. =BLADDER, STONE IN.=--See Concretions or Calculi in Urinary Organs. =BLIND STAGGERS.=--See Staggers. =BLOATING IN CATTLE.=--This disease, sometimes called hoven, is characterized by the distention of the paunch or rumen, and is due to the accumulation of gas. It most frequently occurs when cattle or sheep are pastured on clover or alfalfa, especially if it is moist just after a rain, or when dew is on the ground, and when not accustomed to fresh green food. I have known of many cases where cattle have bloated from eating alfalfa hay during the winter season. There is no mistaking the disease. The animal shows pain, goes off to itself, and breathes with difficulty. Colic is often associated with bloating. The most characteristic symptom, however, is the excessive swelling due to the gas. The bloating is noticed even over the back of the animal, the gas continues to form, and, unless relief is secured, the animal will choke and die as the result. Or some suppression of the vital processes will occur, even rupturing, with the same fatal ending. [Illustration: WHERE TO TAP IN BLOATING