INFECTIOUS DISEASES OF CATTLE. 437 



these investigations in past years. Sulphate of quinia, in doses of 15 

 to 30 grains, according to the size of the animal, has apparently given 

 good results in the hands of some veterinarians, and tincture of aconite 

 root and Epsom salts have been combined with it according to indica- 

 tions of the individual cases. 



The previous pages have reference only to northern pastures. Whether 

 the tick alone, or perhaps other pests also infect cattle which have been 

 taken south, \ve are unable to state without having recourse to experi- 

 mental inquiries. It is reasonable to assume, however, that the same 

 causes are operative in the permanently infected area, and that ticks 

 must be kept away from imported animals, especially during the warmer 

 half of the year if disease is to be prevented. 



Of the means by which ticks may be most easily and effectually 

 removed from cattle or kept away from those not yet attacked, noth- 

 ing definite can be said at present, and there is abundant room for 

 experimentation in this direction, especially within the area perma- 

 nently infested with the cattle tick. 



Sanitary regulations. The disease, outside of the infected district, 

 may be prevented by proper regulations governing the movement of 

 cattle from that district during the season of the year that infection is 

 possible. Such regulations are now made yearly by the Secretary of 

 Agriculture. They define the boundary of the infected district, and 

 provide that no cattle shall go out of it except for immediate slaugh- 

 ter during that portion of the year included between the dates of Feb- 

 ruary 15 and December 1. Cattle from the district going to slaughter 

 can not be driven, but must be shipped by rail or boat. The waybills 

 and cars are marked " Southern cattle " when they cross the boundary 

 line, and when they are unloaded for feeding, watering, or sale they 

 are placed in pens set apart for such animals and into which native 

 stock is not allowed to go. The cars and boats which have trans- 

 I>orted such cattle must be cleaned and disinfected before native stock 

 can be carried. 



By these simple regulations the disease has been almost entirely pre- 

 vented during the last two years, and little or no hardship has been 

 caused to those shipping r handling cattle from the infected district. 

 This success is one of the best illustrations of the value of proper reg- 

 ulations made in accordance with the principles of veterinary science 

 and intelligently administered. 



