GREEN-HOUSE STRUCTURES. 53 



we find this shed indispensable as a potting and packing 

 shed. It will be understood that these green-houses have 

 their ends north and south ; consequently one side is ex- 

 posed to the east in the morning, the other to the west 

 in the afternoon, while at noonday the rays of the sun 

 strike directly upon the apex of the roof. There is nothing 

 arbitrary in having the green-houses end north and south ; 

 a point to the east or west would not make any material 

 difference, but, if circumstances will admit, we prefer them 

 to end direct north and south. 



At present prices, built in a plain, substantial manner, 

 with the outer walls of brick or stone, and heated with 

 hot water, they will cost about $10 per running foot, or 

 $3,000 for the three connected ; if put up singly, the cost 

 would be at least 10 per cent more. 



The smoke flues, as shown in figure 13, can be put up 

 at much less cost perhaps $6 per running foot, in most 

 places ; but when the heating is done by smoke-flues, the 

 houses should not be, on an average, longer than 50 feet, 

 varying, of course, with the locality ; where the ther- 

 mometer falls 10 or 15 degrees below zero, not more than 

 40 feet should be risked; while where the thermometer 

 marks its lowest point at the same figures above zero, the 

 houses may be extended to 70 feet. 



It will be seen by this sketch that two fires only are used 

 for the three green-houses ; the flues from each, passing 

 under the benches on the outside houses, are carried along 

 the end and returned through the middle house. 



This equalizes the temperature in all three, for, although 

 the outside houses get only one run of flues each, these be- 

 ing nearest to the furnace give out just about the same 

 amount of heat to the outside houses as the two returning 

 flues give out in the middle one, as these, being at a greater 

 distance from the fire, contain much less heat. This style 

 of ridge and furrow building of green-houses is especially 

 adapted for florists; hundreds of establishments have 



