BY T. HARVEY JOHNSTON AND M. J. BANCROFT. 



289 



•during the drought. Of these, four were heavily tick- 

 infested and in poor condition ; ten were lightly infested and 

 in fair condition, while the remaining fourteen were in good 

 •condition and absoluteh' free from ticks, eight of these show- 

 ing exudate. 



As examples of persistence of resistance in individual 

 -animals in the same locality, the cows Sweetbriar and Prim- 

 rose may be mentioned. The former has been clean since 

 birth in 1910, and the latter since she acquired resistance 

 Jn 1914. These are amongst the most stronglj* resistant 



Yc.l 



The lightly dotted Imes refers to the actual number of adult stock, the 

 heavily dotted line to the actual number of r&si-ifant adult stock carried 

 each year at Cudgeree, Eumundi. 



animals on Mr. Hull's property. Resistance may persist 

 when an animal is removed to another locality, e.g., Poppy, 

 born in 1912, remained tick-free at Eumundi up till 1915, 

 while since that year she has been at Maryborough and 

 Lakeside in both of which districts she has remained 

 strongly resistant. 



For further instances, one might consult the accounts 

 -given earlier regarding individual cows. 



The heavy infestation of Clover just prior to death may 



