GREENHOUSE STRUCTURES. 



81 



together, each eleven feet wide by seventy feet in length. 

 For colder sections of the country than the vicinity of 

 New York, from fifty to sixty feet in length would prob- 

 ably be sufficient, but much depends on exposure, and 

 the manner in which the building is constructed. One 

 of the houses is heated by the flue, F\ the other by the 

 pipes, P. The boiler, b, shown in the end view of the 

 same house, figure 18, is what is termed a "saddle" 

 boiler, which answers at the same time the double purpose 

 of an arch for the furnace and a boiler. The fire in this 



Fig. 18. END VIEW OF FIGURE 17. 



furnace does nearly the same amount of heating as two 

 such fires, if used in heating by flues only. Thus, by this 

 combination of flue and pipes, the construction of the 

 heating arrangements costs about fifty per cent, less than 

 if the house were heated entirely by hot water. The 

 probable cost of two houses of this kind, each seventy by 

 eleven feet, so heated, and otherwise complete, would 

 cost about $1,000. In erecting all houses on the ridge 

 and furrow plan, the site should, whenever practicable, 

 be such as will admit of extension by future buildings, to 

 meet the increase of business. A good plan in beginning 

 is, to erect three houses, as shown in figure 19, fifty 

 feet in length, so situated, that as business increases, 

 and with more means in hand, the south ends can be 



