VI 



PREFACE 



Acknowledgments are due to Prof. B. M. 

 Watson for information on propagation; and 

 to Professor Slingerland for information on 

 insect pests; Prof. Byron D. Halsted is 

 quoted on fungous diseases. Suggestions 

 have also been received from Mr. L. B. Craw 

 and from Mr. J. A. Payne, in regard to 

 greenhouse construction. 



