210 THE GROUSE IN HEALTH AND IN DISEASE 



prove that they were the cause of the disease, because it is 

 conceivable that they may have multiplied as a consequence 

 of the disease. Nevertheless, taken in conjunction with the 



TABLE II. SHOWING THE RELATIVE NUMBER OF STRONGYLI IN HEALTHY 



BIRDS AND IN THOSE BELIEVED TO BE SUFFERING FROM " GROUSE 



DISEASE " 



* One caecum only counted and the numbers doubled, 

 t These birds came from the same moor. 



changes hereafter described in the mucous membrane of the 

 caecum, and the relation of the worms thereto, it is exceedingly 

 probable that the worms are really the cause of the disease. 

 It is to be noted that the maximum incidence of infection 

 is strictly seasonal, for though in isolated cases or in isolated 



