242 A TICK-RESISTANT CONDITION IN CATTLE. 



on Cheiroptera, birds and reptiles [Escliatocephalus, Cerat- 

 ixodes, Aponom.ma). Then again many require to leave 

 their hosts during certain stages of their development and 

 must regain a suitable host (which need not necessarily 

 belong to even the same order as the former host) for further 

 development. However, the matter is simplified in regard 

 to Booj)hilus since it p».«ses through all its stages on one 

 host animal. 



We know that larval ticks may temporarily infest a 

 great number of different hosts, e.g., the larvae of B. 

 australis may be thus transferred by man, horses, cattle, 

 sheep, marsupials, birds (such as quails, ibis, Charadriiform 

 birds, etc.) Infestation by larvae is then not a satisfactory 

 criterion by itself. We will therefore discard it and use 

 the remaining items for comparison. 



Mr. Hull's resistant cattle. 



We have endeavoured to collect information regarding 

 these animals so as to be able to pass judgment on Mr. 

 Hull's claims. The majority of the cattle referred to in 

 this report have been subjected to the closest scrutiny by 

 one of us for many weeks during the tick season, while in 

 regard to them as well as other cattle formerly in Mr. Hull's 

 possession, a number of casual inspections were also made 

 (1915-1918). 



Peony. The first cow which Mr. Hull claims to have 

 noted as a " tick-killer " was Peony, resistance being 

 observed in 1908. The offspring include Tinkerbell and 

 Poppy iq.v.). 



Clover. A black and white cow was bought at Pinkenba 

 in 1908. This was one of the original cows found by Mr. 

 Hull to be tick resistant, and was selected by him as a 

 suitable subject for experiment, being sold to the Queens- 

 land Government in December, 1912. 



Tinkerbell. Brindle cow, born 1908, dam Peony, 

 became clean by contact with the above (according to Mr. 

 Hull) and was sold with Clover for experimental purposes. 

 Mr. A. H. Cory, who was in charge of the Yeerongpilly 

 Experimental Station in the absence of Mr. Pound, con- 

 cluded the arrangements and as an initial experiment had 



