DR. LEGEAR'S STOCK BOOK. 325 



known how human beings are protected from smallpox, by vac- 

 cination. Young cattle can in the same way be protected against 

 black leg by the use of a special vaccine which is a preparation of 

 weakened virus discovered by Louis Pasteur, the great French 

 scientist. This preventative inoculation is being extensively 

 practiced in Texas and other States in the Union with very grati- 

 fying results. In some districts the death rate from year to year 

 has reached upwards of 30 per cent, but since Pasteur's Black 

 Leg Vaccine has been used it is almost entirely overcome. Stat- 

 istics show that out of 75,000 head of cattle vaccinated against 

 black leg in Texas and other portions of the United States with 

 Pasteur's Black Leg Vaccine, less than one-third of 1 per cent 

 died from the disease, while over 10 per cent of unvaccinated 

 cattle died in the same districts from black leg. 



Vaccine is put up in a fine white powder to be dissovled in a 

 little water at the time of using. Vaccination consists of twa 

 inoculations about ten days apart, by the use of a graduated 

 hypodermic syringe. The most suitable and convenient places 

 for the inoculation are in the shoulders, ears or tail. The most 

 convenient time for vaccinating is at branding time, when one 

 inoculation can be given, and the second given ten days later. 

 The operation can be easily and quickly done in the chute, and 

 when once properly vaccinated the animal is proof against the 

 disease through life. All spring and summer calves should be 

 vaccinated at the fall branding, as black leg generally begins 

 late in the fall and is liable to break out at any time during the 

 fall, winter, or spring. The operation is perfectly harmless to 

 the animal and causes no sore or sickness. It is not advisable 

 to vaccinate during very hot or very cold weather, but at most 

 any other time it is perfectly safe. 



[Any one wishing further particulars regarding the use, price, 

 etc., of this vaccine can address Dr. L. D. LeGear, Austin, Texas,, 

 who is Texas agent for Pasteur's Black Leg Vaccine.] 



