PREFACE ix 



In conclusion I wish to thank my friend Mr. 

 Andrew Pringle for having kindly prepared many 

 of the micro-photograms, illustrating the microscopic 

 appearances, both of the grouse disease and of the 

 fowl cholera and fowl enteritis, and to my friend 

 and pupil, Mr. E. C. Bousfield, for some of the 

 micro-photograms and of the photograms of the 

 cultivations. 



St. Bartholomew's Hospital, 

 January 1892. 



