PREFATORY NOTE ix 



The sweet pea is a favorite flower with 

 the great majority of people. It is en- 

 joyed by both the high and the lowly, and 

 is within the reach of all. It is a profuse 

 bloomer and presents an untiring variety 

 of sizes and delicate colors. It is well 

 adapted to various conditions and can be 

 grown over a very large part of the world. 



The author's training in plant pathology 

 and his large experience with diseases of 

 ornamentals is a guarantee of meritorious 

 character of the work. The work is both 

 practical and scientific; it is equally use- 

 ful to the layman, the commercial grower 

 and to the scientist; it deals not only with 

 the diseases of sweet peas, but with the 

 cultivation and other important questions 

 connected therewith. 



MEL. T. COOK. 

 Rutgers College, 



New Brunswick, N. J. 

 January, 1917. 



