CATTLE LICE AXD HOW TO ERADICATE THEM. 15 



Place the caustic soda in a clean iron tank, tub, or pail, add 1 

 gallon of cold water, and stir until the caustic soda is dissolved. 

 Then begin adding the arsenic, a pound or two at a time, as fast as 

 it can be dissolved without causing the solution to boil, stirring all 

 the time. If the liquid begins to boil stop stirring and let it cool 

 slightly before adding more arsenic. The secret of success is to add 

 the arsenic fast enough to .keep the solution very hot, but not quite 

 at the boiling point. The result should be a clear solution except for 

 the dirt. If the liquid is muddy or milky add 1 gallon of water and 

 stir, and if it does not clear up place the container over a fire and 

 heat nearly but not quite to boiling and stir. As soon as the solution 

 of arsenic is complete, dilute to about -i gallons, add the sal soda, and 

 stir until dissolved. After the solution has become cold add water 

 to make it exactly 5 gallons. 



Emulsify the pine tar as follows: Dissolve three-fourths of a 

 pound of dry caustic soda or concentrated lye (or 1 pound of dry 

 caustic potash) in 1 quart of water, add 1 gallon of pine tar, and 

 stir until the mixture brightens to a uniform thick fluid somewhat 

 resembling molasses. Test it by letting about a spoonful drip from 

 the stirring paddle into a glass of water. It sho,uld mix perfectly 

 with the water. If globules appear which can not be blended with 

 the water by repeated stirring add more dissolved caustic soda, a 

 little at a time, until the desired effect is produced. 



The arsenical stock solution and the emulsified tar prepared as di- 

 rected are sufficient to make 500 gallons of dip. Therefore, 1 gallon 

 of the arsenic stock and about 1 quart of the tar stock added to ap- 

 proximately 99 gallons of water makes 100 gallons of dip. The 

 quantity of stock solution prepared at any one time is limited only 

 by the capacity of the available containers, but the proportion of the 

 ingredients should not be altered. 



Before adding the arsenic and tar stock to the bath fill that part 

 of the vat below the dip line about three-fourths full of water. Then 

 dilute the emulsified tar with about two or three times its volume of 

 water and add it to the water in the vat, taking care to pour it evenly 

 over the entire surface of the water throughout the length of the 

 swim. Add the arsenical solution in the same manner; then add 

 sufficient water to bring the liquid in the vat up to the dip line, 

 stirring thoroughly. 



Manufacturers have placed on the market several brands of ready- 

 prepared arsenical dips, and any of these, if permitted by the Gov- 

 ernment for use in dipping cattle for southern fever ticks, are suit- 

 able for dipping cattle for lice. 



In preparing and using arsenical dip it should be remembered 

 that arsenic is a poison, and due precaution should be taken to avoid 



