INTRODUCTION 5 



It is necessary to use at least a limited terminology to de- 

 scribe the subjects properly, but it has been restricted as 

 much as seemed possible. The glossary also gives a reference 

 to the further description and use of each term. 



REFERENCES 



Bailey, L. H., The Standard Cyclopedia of Horticulture, in six volumes, The Macmiilan 

 Co., 1922. 



, Hortus, The Macmiilan Co., 1935. 



Peattie, Donald Culross, Flowering Earth, G. P. Putnam's Sons, 1939. 



