GREENHOUSE CONSTRUCTION AND HEATING 17 
or causing great fluctuations in temperature. On the 
other hand, great height increases the cost of construc- 
tion, and renders more difficult painting and repairing. 
Materials.—Efficiency and durability should be the 
chief aims in the construction of greenhouses, and these 
can only be attained by the use of the best materials. It 
is false economy to buy cheap lumber, poor pipe, inferior 
glass or low-grade materials of any kind. In bench con- 
struction, however, pecky or worm-eaten cypress, because 
of its relatively low cost, may be employed to advantage. 
Fig. 4.—Boiler room and packing house of a ten-acre range near Toledo, Ohio. 
Arrangement of houses.—Houses should be arranged 
with special reference to the boiler room and the work- 
room. The boilers should always be centrally located. 
This is especially important if the gravity system of hot 
water heating is used. A centrally located packing shed 
or workroom is equally important. Fig. 4 shows a very 
satisfactory arrangement. The trolley car is receiving a 
shipment of cucumbers at the entrance to the packing 
room. Coal is brought by trolley to the boilers at the 
other end of this building, and manure to the large ven- 
tilators along the sides of the houses. An office adjoins 
the packing room, and the pumps that supply the water 
