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power is developed to a high degree in the Ixodid ticks 1 especially, and to 
a smaller degree in the Argasid ticks 2 . In the course of engorgement, particu¬ 
larly as the state of repletion is approached, the chances of injury to which 
a tick is exposed are numerous, owing to the intentional or accidental scratching 
and rubbing of the infested parts of its body by the host, and the remarkable 
power of regeneration of damaged or lost appendages which the Ticks, in 
common with some other Arthropods, have developed, must ensure the 
survival of many individuals which otherwise would perish. 
1 Nuttall, G. H. F. (1920), Regeneration in Ticks. Parasitology, xn. 7-26. 
2 Hindle, E. and Cunliffe, N. (1914), Regeneration in Argas persicus. Ibid. vi. 353-371. 
