CHAPTER Vl. 



GLASS STRUCTURES. 



Glass structures are becoming more numerous each season 

 for raising vegetables and flowers, and are destined to continue 

 to increase in use as the wealth of the country increases. They 

 are referred to here under the head of cold frames, hotbeds and 

 greenhouses. 



Cold Frames. — The term cold frame is applied to frames cov- 

 ered with glass and used to protect plants in winter, or for for- 

 warding them without any heat other than that derived from 

 the sun. It is the simplest form of glass structure. They are 



Figure 24. — Movable frame which may be stored out of the way in the summer. 

 It is generally made of one inch boards and is ver^- cunvenient for those 

 using- only a few sashes. 



generally made 4% or 6 feet wide and of any length or depth 

 which convenience may suggest. The sashes for covering them 

 are generally 4x4i/^ feet or 3x6 in size. The location should be 

 near to water and the house, preferably sloping to the south and 

 well protected on the north and west by buildings, trees, etc. If 

 there is no protection on the north and west, a tight board fence 

 six feet high will answer the purpose. In making the bed the 

 following are requisites: Enough 2x12 in. plank to go the length 

 of the north side and the same length of 2x6 in. plank for the 

 south side of the bed and 2x4 in. stakes, two or more feet long. 



