100 THE FORCING GARDEN. 



good single clip glazing will answer well (see 'figs. 7, 8, 

 and 9), omitting the under glazing, although I would 

 even recommend double glazing for them as a safe- 

 guard against frost, and more economical as regards 

 firing during the winter. Whenever a house for 

 Camellias alone has to be unavoidably built facing the 

 south with one roof only, i.e. a lean-to, it should be made 

 pretty flat and glazed with green glass. In this case 

 the bars may be 18 inches apart. If green glass can- 

 not be had, I advise that a thin transparent green 

 paint be used for a permanency ; for I find that plants 

 do much better under green glass during the summer 

 than under clear white glass : especially is this the 

 case with Camellias. When, however, a house for these 

 can be built with a, span roof running north and south 

 they will do much better than in a lean-to house. 



This house is 14 feet high in the centre, and 7 feet 

 high at the eaves, with 3 feet of glass sashes and 4 feet 

 of brickwork : this gives abundance of head room and 

 elevation enough for large plants all round ; 22 feet in 

 width will give plenty of room for a row of pots next 

 the walls all round where one flow and return 4-inch 

 pipe should be placed. A double flow and return pipe 

 will be necessary for a house of this capacity in the 

 northern counties ; but one flow and return once round 

 the house will be enough for the western counties. 

 If, however, double glazing is adopted, one flow and 

 return pipe will answer for the colder counties, and 

 none at al will be required in the western counties. 

 The pipes should run round close to the walls of the 

 house ; but if a row of plants are planted out into a good 

 peat border next the walls, where they would do well, 

 and nailed on them, they would form a pretty feature, 



