PREFACE TO REVISED EDITION. 



Twenty years ago the First Edition of this Treatise 

 was published. What marvellous changes have taken 

 place in our country during that period. 



Our population has been fully doubled. The Railway 

 has spanned the continent and brought its most remote 

 parts within a few days' pleasant travel of each other. 

 The Telegraph has brought together, as it were, every 

 part of the world. 



Territories that then had scarcely a white inhabitant 

 are now populous and productive States. 



In this general and extraordinary progress, Fruit Cul- 

 ture seems to have held its own. 



In every part of our country, wherever the soil and cli- 

 mate offer the least encouragement, Fruit trees are planted. 

 The fruits of California attract almost as much attention 

 as the products of her mines ; yet, twenty years ago, there 

 was scarcely an apple produced in the State, except in 

 some of the old mission gardens. 



Societies for the promotion of Fruit Culture are organ- 

 ized everywhere. Books on the subject are multiplied 

 rapidly. 



Horticultural periodicals are increasing, and the agricul- 

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