Preface ix 



For several years past I have had an exceptional 

 opportunity of seeing breeding conducted on a large scale 

 through the great kindness of Messrs Sutton of Reading, 

 who have given me the privilege of watching such parts of 

 their work in raising varieties as seemed especially in- 

 structive, with unrestricted access to their pedigree books. 

 From this I have derived much profit, and many hints 

 which have formed the starting point for fuller experiment. 

 My hearty thanks are due to them for this important 

 assistance. 



W. BATESON. 



GRANTCHESTER, CAMBRIDGE. 

 February ', 1909. 



