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, and from Mr. 

 George H. Peterson in regard to the applica- 

 tion of natural and artificial fertilizers. 



