CONTROL OF THE CATTLE TICK. 
Control of the Cattle Tick. 
Life History Investigated. 
By T. HARVEY JOHNSTON, M.A., D.Sc., 
Professor of Biology, University of Queensland. 
The enormous losses caused by the cattle tick pest in Australia, 
combined with the fact that no systematic research in connexion with 
the biology of the tick had been carried out in this country, induced the 
Institute of Science and Industry to appoint a special committee to 
undertake searching investigations on this subject in Southern Queens- 
Engorged Tick 2 Engorged Tick 
Va Laying Eggs 
Adult j aN . 
2nd Moult | 2 
Fea 
lst Moult 
Eggs Hatch and 
Seed Ticks Crawl 
up on Grass 
Seed Ticks get 
on Host Animal 
yy 
Seed Ticks Starve to 
: Death on Grass ~ 
LIFE CIRCLE OF CATTLE TICK. 
land. Previous references in Science and Industry have indicated the 
seriousness of the scourge, which, on a conservative estimate, has inflicted 
i a monetary loss upon Queensland alone of at least £7,000,000. 
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