BY T. HARVEY JOHNSTON AND M. J. BANCROFT. 273 



The cows were washed only onee last year and once this 

 year. A black Jersey bull which never carries ticks was 

 seen, one little vesicle being visible on this animal. 



The inference seems to be that ticks Avere not plentiful 

 that season in this particular valley- at any rate. In regard 

 to other valleys we were told that ticks were abundant. 



On April 8th, a visit was paid to the farm of Mr. Collins, 

 who had a herd of 27 milkers, four being Jerseys and the 

 remainder Shorthorn. The majority of the animals 

 ■examined were fairly free from ticks. Mr. Collins had only 

 washed his cows once that season. These animals were 

 alloAved out on the roads and so had good opportunities 

 to pick up ticks. Mr. Collins told us of three resistant 

 •cows he had purchased from an adjoining farm. An out- 

 break of redwater occurred among his stock three months 

 later and these three animals were the first to die. 



On the same date we visited Mr. Jackson's farm. His 

 milking herd consisted mainly of Shorthorns and Jerseys. 

 They were tick-infested. They had been dipped about a 

 week previous to our visit. Both bulls were ticky. One 

 red shorthorn cow reared in N.S.W., brought into Queens- 

 land five years ago. has not carried mature ticks and has 

 never been dipped during the last three years while in Mr. 

 Jackson's possession. She was shewing exudate when 

 examined. Two Jersey-grade cows bought from Mr. 

 Jones were retaining their resistance. They Avere dipped 

 regularly Avith the rest. Tavo coAvs^a red Shorthorn and a 

 black and white coav were Aaccinated Avith the fresh exudate 

 •on the N.S. W. cow, but the result is not yet knoAA^n to us. 



On April 9th, several farms in the EAvan Valley Avere 

 visited. In W. Gregorys bullock team tAvo little Jerseys Avere 

 pointed out as being resistant to ticks, one especially so. 



At Mr. Walker's farm we Avere shewn a sleek, glossy 

 black Jerse}' cow Avhich did not mature tick ■•. She had been 

 dipped three Aveeks before. No exudate Avas present, but 

 Mr. Walker told us he had noticed it occasionalIA^ He also 

 had eight bullocks Avhich Avere free from ticks and had not 

 been dipped since May, 1917. No vesicles had been noticed 

 on them. The rest of the stock had been dipped a feAA' davs 

 previously. 



