346 THE GROUSE IN HEALTH AND IN DISEASE 



Arachnida. 



We also investigated the tissues of a spider very commou on the moors, and of 

 a phalangid, ^vith an equal want of success. 



Note by Wm. Bygrave, M.A., on the Search for Cysts. 



Since September 1908 I have been making a series of investigations in connection 

 with the " Grouse Disease " Inquiry. My work has consisted of a careful examination 

 of the tissues of certain insects found on Grouse moors in various parts of England 

 and Scotland, the object being to discover, if possible, cysts of the three species 

 of tapeworm which infest the Grouse, viz. : — 



Davainea urogalli (Modeer, 1790). 

 Davainea cesticillus (Molin, 1858). 

 Hymenolepis microps (Diesing, 1850). 



The insects examined to date are specimens of Scatophaga squalida from 

 Ballindalloch, and S. stercoraria from Burley, Dunachton, and Forrigen. 



The specimens were sent to me by Mr P. H. Grimshaw, from the Royal Scottish 

 Museum, Edinburgh, preserved in spirit. 



The method of examination was as folloAvs : — 



The legs and head were removed and the body of the insect teased up in 70 per 

 cent, alcohol as finely as possible with needles, the legs and head being firstly teased 

 and then gently pounded in a mortar. 



The material thus obtained was examined under a cover-glass, a mechanical 

 stage being used to ensure that none of the material was overlooked. The powers- 

 used were Leitz Obj. \ inch and } inch Oc, 2 and 4 ; an oil immersion-lens being 

 used in cases of doubt. So far the examination has yielded no results. Nothing 

 has been found which in any way resembled the cysts, one or two of which have 

 been figured of species allied to the three tapeworms mentioned above. 



