8 



THE GREEN-HOUSE. 



recurring to the figures (pages 5 and 6), is not 

 the case in the plans which we have given as 

 among the best, and it never need happen in any 

 plan. Where a room is lighted from two sides, one 

 side may look into the green-house without inter- 

 change of air, and the other may be devoted to ven- 

 tilating the room. Where a room is lighted from 

 one side only, and there are two or more windows, 

 one of them may look into the green-house, and the 

 other, or other two, may be used for light and ven- 

 tilation. 



But how are we to get over the difficulty of open- 

 ing even one of the windows of a room into a green- 

 house, and thereby interchanging more or less the 

 two atmospheres ? It must be acknowledged that 

 this difficulty cannot be got completely over, and all 

 the advantages of the communication retained. By 

 double glass-doors, and a space between forming a 

 sort of porch, and by having this porch separately 

 ventilated, there would be little danger of interchang- 

 ing atmospheres ; but then the double glasses would 

 greatly impede the view ; and having two doors to 

 open instead of one, before entering the green-house, 

 is also a drawback to its enjoyments. The evil, such 

 as it is, must, we fear, be submitted to, especially as 

 it is not a great one ; for it is not said that the air of 

 a green-house is unwholesome, but merely that it is 

 more charged with vapour than the common air of a 

 a room : — in other words, that a given volume of such 

 air inhaled, will afford less oxygen to the blood than 



