254 THE GROUSE IN HEALTH AND IN DISEASE 



(7J oz.). Two months later the infected chick died, its weight 

 at death being 5 oz., while the weight of its control on the same 

 day was 22 oz. 



Sample weights of other experimental birds are given below : 



NOTE. The three fowl chicks were first treated with coccidian obcysts when aged 

 three weeks. Another fowl chick fed with coccidian oocysts when aged one day, died 

 when nine days old. The pigeon squab was dosed first when aged nine days. 



Another instance of loss of weight resultant on Coccidiosis 

 was seen in the case of a pure bred female Leghorn chick, which 

 was attacked when seven weeks old by Coccidiosis after drink- 

 ing water fouled with coccidian oocysts. This bird became 

 a " chronic," and when adult weighed 67 oz., while its sister 

 bird used as a control weighed 84 oz. 



Besides loss of weight the infected birds become anaemic. 

 The cere, comb, and wattles become much paler, and the blood- 

 vessels beneath the wing also look pale. The head appendages 

 gradually become more and more pale as the disease progresses, 

 and finally acquire a peculiar bluish tint. This tint is shown 

 also in the eyelids and ears, and the legs are affected, though 

 to a less extent. The feathers on the head tend to fall off 

 so that the fore part of the head and the region round the bill 

 become almost bald, and the bird presents a very peculiar 



