286 THE FORCING GARDEN. 



two moveable pannels or boards (painted to repre- 

 sent a window), hung in the manner of common 

 sashes, the one to move up, and the other down, for 

 the admission of air through the tube at top. Thus 

 diverting, or breaking a strong current, which might 

 be prejudicial to the grapes. 



Ventilators in front, at the distance of six or 

 eight feet from one another, may be made thus : 

 Pierce a hole an inch diameter, through the bot- 

 tom rail of the under sash, if the house have no 

 upright glass, or through the upper rail of the up- 

 right sash, if it have. In this hole insert a tin 

 tube to fit, having a funnel mouth, outwards, and a 

 fine rose, like that of a watering-pot, to fit to it in- 

 side. The tube should be made in lengths of two 

 feet each, that the air may be either diffused as it 

 enters through the front, or be carried to the cen- 

 tre of the house, or farther, if thought necessary. 

 When not in use, it should be stopped with a cork 

 or plug. 



When a full stream is wished, the rose need not 

 be put on ; but it should, if the air be keen. In 

 order the better to collect the air, the funnel 

 should be pretty large ; that is, about seven or eight 

 inches diameter. 



With these, and with the ventilators at or near to 

 the top of the back- wall, as mentioned above, any 

 hot-house may safely be aired, or ventilated, even in 

 the severest weather ; and also when it may be im- 

 proper to open the glasses, as in rain. 



