376 First Report on the Experiments carried on 



indebted, in such a way as to render it easy to lift the sashes 

 out of their frames when it is wished to remove them. This 

 is effected by the pin of the hinge being screwed on the side 

 of each end of the sash, and falling into a corresponding half 

 circle of metal in the frame of the sash. This method is 

 found extremely useful, and not at all liable to be deranged 

 either by use or neglect. 



Curvilinear Houses. These Houses are formed with curvi- 

 linear bars of wrought iron resting in front upon the plate of 

 a low wall, and at back against the face of the back wall. They 

 are built as two distinct houses, the one facing the south, the 

 other the north. That to the south is fitted up withinside 

 with a stone shelf on a level with the wall-plate, running along 

 the sides and front, and a hollow chamber, over which is a 

 sand-bed, heated by an internal flue along the centre. No tan 

 is used in this house. The back is without shelves, but 

 several niches have been contrived in the wall which receive 

 the half of as many large pots, in which are planted trees 

 trained to a trellis, over the whole back of the house. Wires 

 are also fixed to the roof from front to back, and from end 

 to end, for supporting climbing plants. The north house, 

 which was designed as a propagating house, has a stone 

 shelf at the back, and a hollow chamber with a sand-bed 

 over it in front, and is heated by a single flue, which, en- 

 tering at the front, runs through the interior of the chamber, 

 and, imparting a certain degree of heat to the sand-bed 

 above the chamber, returns by the back. The two ends of this 

 last house are not glazed, being of brick work. In remark- 

 ing upon these houses, much pleasure is felt in being able 

 to state that, as far as experience in them has gone, their 



