By Mr. James Acon. 



3 



currents of cold air that blow through the interstices of the 

 glass in stormy weather ; in the latter the plants are fre- 

 quently scorched, from the intense heat of the flue, and 

 consequently yield very scanty and uncertain crops. 



For the Early Forcing, a great command of heat is essenti- 

 ally necessary, to secure which, the house here described 

 was constructed with two flues, that first pass along the 

 middle of the house, and then returns in the back wall; 

 the fires are placed at each end behind; thus the heat is 

 equalized to a great nicety. The operation of forcing com- 

 mences on the first of September, the fruit begins to be 

 ripened about the first week in March, and continues to be 

 gathered till the middle of May. The Vines are trained 

 horizontally on the trellis and on the back of the house. Some 

 are also trained on the rafters, but these last are introduced 

 six weeks after the forcing of the first has commenced, and 

 they yield a succession crop, which begins to ripen early in 

 May* The form of this house gives it a peculiar advantage 

 over most others, in presenting a greater surface for the 

 growth of the Vines than could be derived from any other 

 plan ; the trellis which covers the flues is nearly equal to the 



• At the commencement of this Paper, I stated that I was enabled to provide 

 a regular supply of fruit from my Vines throughout the year. This is effected 

 as follows : — The late-house crop lasts from the middle of January to the end of 

 March ; this is succeeded by the first crop in the early house, which carries on the 

 supply into May, and it is continued by the Grapes on the rafters in the same 

 house, until the Vines in the Pine stoves, which are forced early in January and 

 February, produce their crops. These keep in bearing through the summer, when 

 a Vinery, which I begin to force about the end of March, furnishes the supply 

 till the late-house fruit is ready in January. This completes the succession, 



