XVlll 



Preface 



Magazine, the Directors of the Highland and 

 Agricultural Society, The President and Council of 

 the Royal Horticultural Society. 



I am exceedingly grateful to Professor Curtis, 

 Professor Reed, and Miss M. L. Keene, of the 

 University of Missouri, for their generous help in 

 placing at my disposal their notes of my brother's 

 lectures delivered at Columbia in 1914. 



Professor J. A. Thomson, of Aberdeen, has had 

 the kindness to read the proofs of the first part of 

 the book, and I have greatly benefited by his know- 

 ledge and insight in a number of corrections. 



I owe a special debt to my friend Mr. A. D. 

 Lindsay, of Balliol College, Oxford, for his help and 

 advice throughout the preparation of the book. 



Helen Darbishire. 



Boar's Hill, Oxford 

 August, 191G 



