252 A tick-r::sista>"t coxdition ix cattle. 



February 11th, 1^18. A mature female tick was removed 

 on 28th January and another on 9th February ; extremely 



few ticks ill any stage could be found. March 18th- 24th, 

 calved. Xo trace of ticks except a few larvie. Exudate 

 extensive. June 7th, still very clean but more immature 

 ticks were noticed than in March and a few mature females 

 were removed. This cow is very strongly re.^istant for suck 

 a young animal. 



In October. 1911. ten heifers were purchased from M. 

 Bourke. Rosewood, by Mr. Hidl. who reported that they 

 were all ticky on arrival at Eumundi and were turned 

 into a small scrub paddock with Clover. Tinkerbell. Peony 

 and other dry stock, for nine months. During this time- 

 they were not dipped or treated in any way for ticks. Th& 

 results of this experiment were as follows • — 



died, 1912. 



became resistant, 1913 ; died, L91.5 (drought). 



became rasistant, 1914; sold, 1916 



became resistant, 1915 ; .sold, 1917. 



remained ticky, died 1916,. 



became resistant. 1915 ; sold, 1915 (drought). 



became resistant. 1913. 



became resistant, 1914. 



became resistant. 1914. 



became resistant, 1913. 

 For condition of progeny of these cows see genealogical 

 tables. 



The foui last named are still in Mr. Hull's possession ; 

 of these Peewee and Kittiwake were milkers and were 

 examined regularly by us during our stay early in 1918. 



Kitiixcake, bought from M. Bourke, Rosewood, 1911 ► 

 A black Jersey with a very black greasy skin. 



On 24 '6/16 a few larvae and nymphs seen : no engorged 

 ticks present ; yellowish crystal- like exudate ; also tick 

 sores associated with a number of which and partly buried 

 in the lymph were ticks. 



From January 16th-February 11th, 1918. this cow 

 was examined twice daily (except on 27th-30th January, 

 inclusive;. Males, nymphs and larvae were always more 

 or less in e%-idence but only three fully-matured females 

 were observed, one being removed January 16th and two 

 on February oth. Tick sores appeared from time to time ; 



