16 



by the expansion or contraction of the air between. 

 This confined air is one of the worst possible conduc- 

 tors of heat, keeping the house from being rapidly 

 cooled during even the coldest weather. (Johnson's 

 Princ. of Gardening.) 



In conformity with the foregoing principles, Mr. 

 Saul, of Castle Hill, Lancaster, has given the accom- 

 panying section of a viner} r , as the form best suited 

 for keeping late grapes. The great superiority which 

 a house of this construction has over the old form is, 

 first, that by the nearly upright position of the glass, 

 scarcely any of the rays of the sun are lost ; while, 

 for the same reason, scarcely a drop of wet can find 

 its way into the house. Another recommendation 

 for this plan is, the small space to be heated ; conse- 

 quently the temperature can the more readily be 

 raised to any degree required. This kind of house 

 will also be the very best for early forcing, as, from 

 the small space to be heated, one boiler placed in 

 the centre would be quite sufficient for heating a 

 house of 150 feet in length. This kind of structure 

 differs very little from that recommended by the late 

 Mr Atkinson, except in the more upright position of 

 the sashes ; and probably the method of ventilation 

 adopted by Mr. Atkinson would be found the best. 

 The upper sashes could, however, be made to slide up 

 and down, if necessary. 



