in an insecticide- solution which v/ill kill the ticks without 

 in any way injuring the sheep. 



the engorging of the female tick with blood is one 

 of the essential functions of reproduction, and this gorging 

 must of necessity take place upon, the -larger manuals \7hioh 

 serv.e KB -hosts to the tirfc. The U.. S. b5.clogj.cal survey has 

 reached the conclusion that the great bulk 6f the fever ticks 

 which become filled with blood get their supply while at- 

 tacnj&d to domosti(y Btoc.*t c and that if the d^nostic animal a 

 are freed of ti^ks by dippl:igj by spraying, or by SO&B ether 

 effective nr.otMd of treateant, the chancee of the infection 

 of hurtan bo Ing* will "be vastly reduced. Of the different 

 dorriettic rr;l^-vl^ the. sheep la the most readily handled and 

 tlx-3 easiest to dip or tre,t f hence the selection of sheep for 

 use in the experiment* 



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