PREFACE 



Having been engaged for the last five years in 

 collecting data as to the etiology and pathology of 

 grouse disease, I find that the time has arrived 

 when I am enabled to give a coherent account of 

 the subject ; the number of grouse, dead or dying 

 naturally from the disease, which I have dissected, 

 and which were derived from different parts of 

 England and Scotland, sent to me during several 

 years through .the kindness of the Editor of the 

 Field, is very considerable, as will be fully referred 

 to later ; the number of cultivations from the grouse, 

 the number of experiments with cultivations on birds 

 and mammals has been sufficiently large to enable 

 me to draw definite conclusions as to the nature ofj 

 those cultivations. To the Editor of the Field, and 

 through him to many gentlemen, both in England 

 and Scotland, interested in grouse, my best thanks 

 are due for the valuable assistance which I received 

 from them. The second disease treated here is a 



