THE 
HORTICULTURAL REGISTER. 
May 1st, 1833. 
PART I. 
ORIGINAL COMMUNICATIONS. 
HORTICULTURE. 
ARTICLE I.—ON THE VENTILATION OF FORCING-HOUSES. 
BY MR. STAFFORD. 
This subject requires the greatest attention of every person occupied 
in this description of buildings, for whilst the practice exists of 
erecting these houses with no other means of admitting cold air, 
than through apertures in the front, and driving the hot air through 
others in the back wall, the success will be very precarious, and disap¬ 
pointments often great. It is very plain, that, to admit air, often as 
low as 32 degrees, into a house when the temperature is 75 or 80 
degrees, must necessarily be injurious when it comes in contact with 
the stems of the trees or plants, which are in so high a degree of ex¬ 
citement. The instant this takes place on the lower part of the plant, 
the sap which is in a very fluid state, becomes coagulated, and there¬ 
fore impeded in its ascent, and so long as the action of this current 
continues, the fluids remain either stagnant, or becomes inclined to 
recede. 
Nothing will exemplify this better, than to insert the tube of a 
goose quill into the trunk of a common birch, (which tree thrives 
nearer the north pole than almost any other.) If this be done du¬ 
ring the time of circulation, and particular attention be paid to ob- 
VOL. If. no. 23. 
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