312 DR. LEGEAR'S STOCK BOOK. 



the means of conveying ticks from one part of the country to 

 another. Knowing that Southern cattle when free from ticks 

 arc harmless to Northern cattle, various experiments have been 

 going on as to the best means of destroying these ticks. The 

 dipping process, up to the present time, has proven the most 

 effectual. All cattle, before being shipped North, should be 

 dipped in a vat made for the purpose, when they can be safely 

 taken into non-infected territory. 



Treatment. When once the disease has broken out, the heal- 

 thy should be separated from the sick animals and put upon noii- 

 infected pastures. While this may not cut short the disease, it 

 may save the lives of some by removing them from the possibility 

 of being attacked by more young ticks; also prevents a second 

 later attack in October or November, which is caused by another 

 generation of ticks. As far as possible, remove all ticks from 

 the sick and well animals. To accomplish this, apply some oil, 

 as cottonseed oil or black machine oil, with a paint brush, to 

 those parts usually affected. The giving of sulphur is said to 

 cause the ticks to loosen their hold and drop off. Medicinal 

 treatment, so far, has been useless, as nearly all animals having 

 the acute form of the disease die. It is quite probable that the 

 blood serum (sero-vaccine) treatment by vaccination, lately com- 

 ing into use, will produce immunity from the disease. This is 

 a departure from all the methods previously employed in this dis- 

 ease. It is simply a test of a law laid down by Behring, namely, 

 that if an animal has acquired immunity against a disease pro- 

 ducing micro-organisms or its toxins, the serum from tjie blood 

 of the immunized animal will prevent the disease in another sus- 

 ceptible animal. 



How well we know that immunity (proof) from smallpox is 

 acquired by vaccination; also the anti-toxin treatment in the 

 cure and prevention of diphtheria. So we believe the same re- 

 sults can be obtained by what may be called the "anti-toxin" or 



