BY CUTTINGS OF IMMATURE GROWTHS. 157 



five feet high, and a row of low frames may be placed 

 under the eaves on the sides, as shown in figure 53, or be 

 omitted, according to the taste of the builder or nature 

 of the plants to be propagated. 



The glass should be of the best quality, and double 

 thickness is preferable to the single. Embed the glass 

 with putty, and fasten with glaziers' tins, but put no 

 putty on the outside ; use nothing but thick white lead 

 paint in the joints between glass and sash. The size of 

 glass is immaterial, but if the best and heaviest is used, 

 the panes may be of any size, from seven by nine up to 

 ten by sixteen, or even larger. Large sized glass, however, 

 is more expensive than small ; it breaks quite as readily ; 

 consequently, repairs, where large sized panes are used, 

 are likely to be the most costly. The furnace and potting 

 room should be placed at the north end of the house, if 

 such an arrangement can be made without inconvenience, 

 and then the south end may be of glazed sash, as shown 

 in figure 53. 



The best and most economical mode of heating a large 

 house is by hot water. For this purpose there are several 

 kinds of boilers in market, each of which has its friends 

 among the florists and nurserymen, but all of those now 

 in common use are economical, safe, and generally give 

 satisfaction. The hot- water pipes should lie side by side, 

 although they are sometimes placed one over the other, 

 when it is inconvenient, for want of space, to place them 

 the other way. The flow- pipe passes under one of the 

 side frames, thence through the back under the middle 

 one, and then under the frame on the opposite side. The 

 return-pipe passes back along by its side, both lying on 

 iron rests made for the purpose. This arrangement gives 

 eight pipes the whole length of the house, besides the 

 elbows and the few feet that it takes to cross the end. 

 The center frame has four pipes under it, while those on 

 the sides have but two. In mild climates, where less 



