BY T. HARVEY JOHNSTON AND M. J. BANCROFT. '211 



On February 7th an examinatioTi of Mrs. Lewis" milkers 

 at Bartlett's dairy was carried out. There were over ")0 

 milking cows of all breeds and grades- — Shorthorn, Ayrshire. 

 Jersey. They were dipped four weeks ago for the second 

 time this season. Eight cows were noticed as specially 

 free from ticks ; in four of these the Jersey strain predomin- 

 ated ; in all the skin was more or less yellow, in three it was 

 markedly so. The majority of these showed the littl* 

 characteristic scabs and lumps on the escutcheon and neck. 

 Mr. K. Lewis informed us that some years ago they had 

 from 20-30 resistant cows that were never dipped, some of 

 which shewed an exudate similar to that occurring on Mr. 

 Hull's resistant stock. After a while it was found too great 

 a trouble to cut out the resistant animals and all were put 

 through the dip. They now find it necessary to dip them. 

 Mr. Lewis considered the dipping destroyed their resistance. 

 He also vaccinated about three cows with some serum ; 

 all " took/" becoming clean a few months later and remain- 

 ing so until dipped. 



On February 7th, a visit was paid to Mr. Bevan's farm, 

 where there were seventeen milking cows which had been 

 sprayed recently and did not exhibit many ticks. On© 

 cow was shewn which it was stated never carried ticks. 



Information obtained from Messrs. Inigo Jones, O. Jenner 

 and other farmers, Crohamhurst, via Beerwah, 

 North Coast Line. 

 On April 6th, 1918, one of us visited Crohamhurst and 

 examined a number of Mi-. Inigo Jones' tick-resistant stock. 

 Mr. Jones has 40 adult cows ; of that number 18 may be 

 considered resistant. During the last 12 months at least 

 nine resistant animals were sold. Jersey and Shorthorn 

 are the outstanding breeds. The resistant animals exhibited 

 typical exudate as well as tick sores on many of them. Mr. 

 Jones practises vaccination, his method being to scrape the 

 escutcheon of a ticky animal with a clean knife until drops 

 of blood appear, then to take a scraping from the escutcheon 

 of a resistant animal, both pus from tick sores and serous 

 exudate being included indiscriminately, and rub this 

 mixture into the abrasion made on the ticky animal. In a 

 large proportion of cases this method, according to Mr . 



