HOW TO GET THE LAST TICK. 13 



Never use a bath carried over the winter. In pre- 

 paring the bath for the first spring dipping it should 

 not test higher than 0.14 per cent, as indicated by the 

 field test for arsenical bath. At the following two or 

 three dippings the strength of the solution should be 

 increased gradually until it will give a test of about 

 0.18 per cent, and it should be held to a test of between 

 0.18 and 0.20 per cent for the remainder of the dip- 

 ping season by replenishing, or in case it becomes 

 filthy, by complete renewal. 



In systematic tick eradication it is best to begin 

 dipping during March, for the reason that that is the 

 beginning of the period when tick development is 

 rapid, and the length of time they will live on the 

 host and on the pasture is shortest. Proper dipping 

 of all cattle in a given area at 14-day intervals, begin- 

 ning in March and continuing until November, will 

 result in complete eradication of the cattle tick. 



ORGANIZATION OF FORCE. 



In tick eradication it is customary to take ' up 

 systematic work in units, a county usually comprising 

 such a division, in which the work is carried on by a 

 cooperative State, county, and Federal force working 

 in that county. This force should consist of a super- 

 vising inspector, local inspectors, and range riders. 



Supervising inspector. — The duties of the supervis- 

 ing inspector are to keep in close personal touch with 

 all details of the work, to assign the local inspectors 

 and range riders to their divisions of territory, in- 

 struct them regarding their duties, and personally 

 supervise their work. All reports rendered by local 

 inspectors and range riders should pass through his 

 hands, and any irregularities, such as failure to dip, 

 complaints, etc., should be promptly investigated and 



