is the cyst mentioned above, which, passing 

 from the body, infects the whole moor. There 

 are many details omitted in this short abstract 

 of the complicated life history of this parasite,, 

 which have been worked out in the grouse by 

 Dr. Fantham at Cambridge ; but enough has 

 been said to show the nature of the disease, 

 which is well known to occur in several other 

 animals. There is a Coccidiosis of the rabbit,, 

 and a very fatal form attacks pigeons, fowls,, 

 and pheasants, and the grouse Coccidium if 

 administered to chickens will set up the disease 

 in fowls. 



As a rule grouse are most susceptible to 

 Coccidiosis during the first six weeks of their 

 life, and if they can survive the dangers of 

 this period they usually grow up. The chief 

 external symptom of the disease is diarrhoea, 

 the legs show weakness, and the feathers, 

 especially around the legs, are in poor condition, 

 flight is feeble, and the bird loses weight. 

 Internally the alimentary canal is inflamed and 

 digestion greatly impaired ; perityphlitis is set 

 up around the caeca, which become greatly 

 enlarged. The blood corpuscles also undergo 

 marked alteration, and an anaemic condition 

 prevails. Further, the destruction of the lining 

 wall of the alimentary tract allows the escape 

 of bacteria which are all very well in their 

 place i.e., the cavity of the intestine but 

 which are apt to set up trouble when they make 

 their way into other tissues. This is, however,, 

 but a subsidiary matter ; the real injury caused 

 by the Coccidium is the destruction of the 

 lining membrane of the alimentary canal. 



Coccidiosis may be spread from moor to 

 moor by the agency of flies. The maggots of 

 certain flies readily eat the cysts, and it has- 



