PREFACE 



In 1912 the author was asked to present a 

 paper before the National Vegetable Grow- 

 ers' Association on the construction and 

 equipment of greenhouses, with special refer- 

 ence to the vegetable forcing industry. Much 

 of the data given in this paper had been 

 hitherto unavailable and was based on an 

 extensive personal survey of greenhouse 

 owners and operators, supplemented by per- 

 sonal experience and observation. So great 

 has been the demand for this data that at the 

 request of the Orange Judd Company, the 

 author has undertaken to incorporate it in 

 book form. The present volume attempts 

 a more thorough discussion of the subject 

 than could be given in a single paper. It 

 is based upon a series of lectures given be- 

 fore the author's classes. 



This is the second book, dealing exclu- 

 sively with this subject, which has been pub- 

 lished in the United States. The former, 

 written by Prof. L. R. Taft and published by 



