236 Arthropods as Essential Hosts of Pathogenic Protozoa 
ordinary fission in the cells of the Malpighian tubules and gonads. 
Some of the coccoid bodies are formed in the lumen of the gut and 
Malpighian tubules. The result is that some of the coccoid bodies 
may be present in the Malpighian secretion and excrement of an 
infected tick and when mixed with the coxal fluid may gain entry 
into another fowl by the open wound caused by the tick’s bite. They 
then elongate and redevelop into ordinary spirochastes in the blood 
of the fowl, and the cycle may be repeated. 
Hindle’s account is clear cut and circumstantial, and is quite in 
line with the work of Balfour, and of Leishman. Radically different 
is the interpretation of Marchoux and Couvy (1913). These investi¬ 
gators maintain that the granules localized in the Malpighian tubules 
in the larvae and, in the adult, also in the ovules and the genital ducts 
of the male and female, are not derivod from spirochaetes but that they 
exist normally in many acariens. They interpret the supposed 
