A GENERAL VIEW 3 
and some of the ranges covered four acres of land. This 
district then had about 60 acres of glass devoted ex- 
clusively to vegetable forcing. 
There are more acres of glass devoted to this industry 
in Ohio than in any other state. In 1912 Toledo had 
about 40 acres under glass, one of the ranges covering 10 
acres; Cleveland had about 25 acres and Ashtabula 
probably an equal area. There are large houses at 
Newark, Columbus, Cincinnati, Lancaster and many 
other smaller cities and towns. It is estimated that, in 
1912, about 140 acres of glass were used in Ohio for the 
forcing of vegetables. Greenhouse building has been 
active in some of these sections since the 1912 estimates 
were made. 
Although there are some spacious houses at various 
places in Michigan, Grand Rapids is the most important 
center. This district had from 35 to 40 acres of vegetable- 
forcing houses in 1912, and one establishment covered 
over four acres of land. 
Irondequoit, New York, is well known for its large 
number of houses of medium size. No establishment in 
this district contains more than four acres, and most of 
the ranges cover less than one acre. There were 65 
houses in 1912 within a radius of three miles, and they 
included a total area of about 25 acres, so that the average 
is less than one-half of an acre. They are almost invari- 
ably operated in connection with market gardens, and 
are of great value in the starting of early plants. 
There are many vegetable-forcing establishments in 
Pennsylvania, although less progress has been made 
there than in several other states. The industry is most 
prominent at New Castle, Erie, Altoona and Kennett 
Square. 
In Illinois there are large ranges at Chicago, Aurora, 
Streator, Morrison and other points. There are many 
extensive establishments in Indiana, Iowa, Minnesota, 
