A GENERAL SURVEY 9 



and only 178 in 1860. It was not until 1890 

 that greenhouses had assumed sufficient im- 

 portance to secure a place in the census re- 

 ports. At that time there were 4,659 estab- 

 lishments covering 38,823,247 square feet, 

 valued at $38,355,722. 



The following table shows the total num- 

 ber of square feet under glass in the United 

 States and ten principal states, as shown in 

 the census reports for 1910, 1900 and 1890. 

 The rank of the states has changed material- 

 ly during the past 30 years. 



AREA UNDER GLASS IN THE UNITED STATES AND TEN 

 PRINCIPAL STATES. FROM CENSUS REPORTS 



Estimated. 



