THE ZOOLOGIST. 



THIRD SERIES. 



Vol. XVI.] OCTOBER, 189 2. [No. J 90. 



THE CAUSE OF GKOUSE-DISEASE, AS EXPLAINED 

 BY Dr. KLEIN, F.B.S. 



For the volume on this subject recently published by 

 Dr. Klein* we have not been altogether unprepared. It will 

 be in the recollection of our readers that in 1887 Dr. Klein, at 

 the request of the Editor of * The Field,' undertook to investigate 

 this subject, and proceeded for that purpose to Scotland, where 

 he was enabled to examine, immediately they were found, birds 

 of all ages which had died from the so-called grouse-disease. 



The result of the investigations then made was published in 

 a Report (Zool. 1887, pp. 327 — 337), which may be said to have 

 paved the way for the more comprehensive and illustrated 

 treatise now before us. 



From time to time various theories have been put forth to 

 account for the disease, but none have been supported by 

 evidence sufficient to warrant their unqualified acceptance. 

 Dr. Klein examines the views of five different observers by way 

 of introduction to his subject. The late Dr. Cobbold, a high 

 authority on the nature and development of parasites, is first 

 quoted as the founder of a theory of grouse-disease. In 

 Dr. Cobbold's opinion, the ailment was due to parasitic invasion 

 — or, in other words, to the infestation of the birds by worm 



* < The Etiology and Pathology of Grouse Disease, Fowl Enteritis, and 

 some other Diseases affecting Birds.' By E. Klein, M.D., F.E.S. With 

 fifty-three illustrations. 8vo, pp. 140. London : Macmillan & Co. 



ZOOLOGIST.— OCTOBER, 1892. 2 G 



